It' s high time the government _________ some measures to raise people' s awareness of environmental protection.

It' s high time the government _________ some measures to raise people' s awareness of environmental protection.
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    To be sure， some insects can build complex societies ________ different types of individuals performing different tasks.

    To be sure， some insects can build complex societies ________ different types of individuals performing different tasks.
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      The students will put off the outing until next week， ________ they won’t be so busy.

      The students will put off the outing until next week， ________ they won’t be so busy.
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        If you do not fasten your safety belt， your chances of being ________ will be greater.

        If you do not fasten your safety belt， your chances of being ________ will be greater.
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          I found my daughter sitting in the kitchen， crying ________.

          I found my daughter sitting in the kitchen， crying ________.
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            When the two young people were married， the ceremony was anything ________ up to date.

            When the two young people were married， the ceremony was anything ________ up to date.
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              —Is this course rather difficult? —Yes. That’s why I ____ it.

              —Is this course rather difficult? —Yes. That’s why I ____ it.
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                The apartment caught fire last night. Fortunately, most of the people there _______ escape.

                The apartment caught fire last night. Fortunately, most of the people there _______ escape.
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                  Slavery was _________ in the U.S. in the 19th century, and slaves were given equal rights.

                  Slavery was _________ in the U.S. in the 19th century, and slaves were given equal rights.
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                    I’d like to buy a house---- modern, comfortable, and ______ in a quiet neighborhood.

                    I’d like to buy a house---- modern, comfortable, and ______ in a quiet neighborhood.
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                      It has been revealed that some government leaders ____ their authority and position to get illegal profits for themselves.

                      It has been revealed that some government leaders ____ their authority and position to get illegal profits for themselves.
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                        The leader is losing ground as the rest of the runners __________.

                        The leader is losing ground as the rest of the runners __________.
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                          It is said that in Africa over a third of the population were believed to have no ______ to the health care and advanced education.

                          It is said that in Africa over a third of the population were believed to have no ______ to the health care and advanced education.
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                            Because of the snow, many parts of the countryside are only ______ by helicopter.

                            Because of the snow, many parts of the countryside are only ______ by helicopter.
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                              The best method to _____ this goal is to unite as many people as possible.

                              The best method to _____ this goal is to unite as many people as possible.
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