14. Water can absorb and give off a lot of heat, thus ________ a stable environment.

The mother said, “ Be friendly to others.”  The mother ____ friendly to others.

The owner of the restaurant was afraid of ___________ in debt and decided to do some research _______ healthy foods to change the situation.

— What did you think of the film last night?  
— Really wonderful! It’s well worth _____.

18．An explosion in a coal mine in Heilongjiang on Nov. 21, 2009______at least 106 workers dead.

16．－What about going abroad?
－Great, but I never expected______a chance for me before.

6．If not_____ from work, I will spend some time________in my study every evening.

While shopping, people sometimes can’t help _______ into baying something they don’t really need.

Wendy hurried to the airport, only ______ the pop singer had left.

I’d rather have a room of my own, however small it is, than _______ a room with someone else.