________ the Internet is of great help, I don’t think it’s a good idea to spend too much time on it.
| A．While | B．As | C．Because | D．If |
---Are you free after school?
---Sorry, I’ve planned to treat a friend of mine to dinner___for his help.
| A．in trouble | B．in fact | C．in total | D．in return |
The old castle is well _____ visiting.
| A．worthy | B．worth | C．valuable | D．reliable |
There is no____ that China will be a powerful country in the future.
| A．doubt | B．wonder | C．need | D．worry |
―I’m too tired. I want to give up.
― If you don’t ________, you’ll win in the end.
| A．lose heart | B．calm down | C．take care | D．cheer up |
---What did the Englishman say?
---Oh, he asked where ____ .
| A．did you come form | B．do you come from |
| C．you came from | D．you did come from |