1 . It was not until he came back from Africa that year ________ he met the girl he would like to marry. （用适当的词填空）

2 . I can’t remember what it was ________ made the teacher give Mary the permission to leave the class earlier. （用适当的词填空）

3 . Such ________(be) Tom, a shy boy who was determined to face challenges. （所给词的适当形式填空）

5 . Like so many other things, it is only too much stress ________ does you harm. (用适当的词填空)

6 . It was he ________ showed me how to smile through the rough times. （用适当的词填空）

7 . They said never before ________ they experienced so interesting a class. （用适当的词填空）

8 . No sooner________Mo Yan stepped on the stage than the audience broke into thunderous applause. （用适当的词填空）

9 . Only then________(do) they realize how much damage had been caused. （所给词的适当形式填空）

10 . In the backyard ________(be) two happy dogs tumbling about on the grassland. （所给词的适当形式填空）