1 . They spent a whole day ________(search) for their missing son. Finally he ________(spot) sitting in the park. (所给词的适当形式填空)

2 . Mr White is a careful and ________(experience) engineer, so he is often ________ (appoint) to finish some ________ (challenge) tasks.（用所给词的适当形式填空）

3 . Few details could be _____(辨别) on the photo because it’s too old. (根据汉语提示单词拼写)

4 . A new kind of drug _____(develop) by the scientists and they are hopeful that they will succeed in a couple of months. (所给词的适当形式填空)

5 . Huge quantities of good soil_____(wash) away because floods happen frequently in that area. (所给词的适当形式填空)

6 . Up to now, large quantities of food ________________ (send) to India to save the dying. (所给词的适当形式填空)

7 . We ________________ (tell) that the environment can be better by our sorting garbage . (所给词的适当形式填空)

8 . —Why do you look so worried?
—My computer broke down and my homework ________________ (leave) unfinished since. (所给词的适当形式填空)

9 . The construction of the two gyms ________________ (complete) by now. (所给词的适当形式填空)

10 . Many a new measure ________________ (put) forward to reduce air pollution so far. (所给词的适当形式填空)