46.  他直到发现得了癌症才戒烟。

He_________________________________ he found he had cancer.

3.  ―How do you practice speaking?

―By having________ (conversation) with friends.

2.  How can we find our pen__________ (pal)？

1.  I think the ________ (express) on her face is very strange. 

45.  The government should do something to help those_______________ (home) people.

44.  It seems that he has____________ (succeed) solved that problem.

43.  My grandmother still stays healthy in her______________ (ninety).

42.  They often meet and share their_____________ (think), feelings and experiences.

41.  She has been a member of the_____________ (nation) table tennis team for five years.

5.  He made a g_________ (语法)mistake.