31．The Smiths _______ sending emails _______ letters．Because it's faster．

A．prefers；to writing                                  B．prefers；to write

C．prefer；to write                                      D．prefer；to writing

30．I like to sit in the front row _______ I can see the blackboard clearly．

A．not until              B．as if                    C．so that                   D．even though

29．I've thought about the problem for three days．I hope I could _______ with a good idea．

A．end up                 B．meet up               C．keep up               D．come up

28．--Would you go to the concert with me tonight?

--Thanks，but I'm really busy．If I _______ time，I would certainly go．

A．will have             B．have had              C．had                        D．have

27．I felt bad．Father asked me _______ with me．

A．what was the matter                                 B．what wrong was

C．what is wrong                                         D．what's the trouble

26．--Where is Mr. Lee? Is he in his office?

--He _______ be in his office，for I saw him going out just now?

A．can                     B．can't                    C．must not              D．must

25．His writing is better than _______ in our class．

A．any other             B．anyone else          C．anyone's                 D．anyone else's

24．Nothing could _______ him _______ speaking out against the wrong things．

A．prevent；from    B．made；from         C．get；out                D．keep；out

23．He had a little difficulty _______ the problem．

A．solve                   B．to solve               C．solved                    D．solving

22．As for fast food，_______ love it very much．While _______ hate it very much．

A．some；other        B．some；others          C．one：the other        D．any；the others