1 . His problems __________ (root) deeply in his childhood experiences. (所给词的适当形式填空)

2 . So far it ________ (confirm) that the meeting will take place next week. (所给词的适当形式填空)

3 . It _________ (prove) that a balanced diet is good for health. (所给词的适当形式填空)

4 . In spite of all the problems, several of the players produced excellent ________ (perform). (所给词的适当形式填空)

5 . Self-driving is an area _________China and the rest of the world are on the same starting line.(用适当的词填空)

6 . Ordinary soap, ____________ (use) correctly, can deal with bacteria effectively. (所给词的适当形式填空)

7 . Most colleges now offer first­year students a course specially ____________ (design) to help them succeed academically and personally. (所给词的适当形式填空)

8 . Amy, as well as her brothers, ________ (give) a warm welcome when returning to the village last week. (所给词的适当形式填空)

9 . I wasn’t sure whether he ________ (lend) me his book the next morning. (所给词的适当形式填空)

10 . Anxiously, she took the dress out of the package and tried it on, only ________ (find) it didn’t fit. (所给词的适当形式填空)