1 . They held a meeting________they could hear everyone’s ideas.
| A．even if | B．until | C．while | D．so that |
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2 . ________ the reasons behind wild animals entering our cities, one thing is for sure-as it’s often a means of their survival, they could be with us to stay.
| A．However | B．Whenever | C．Whatever | D．Whichever |
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3 . I hope all the precautions against air pollution, _____ suggested by local government, will be seriously considered here.
| A．while | B．since | C．after | D．as |
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