31．Gao Mei _________ be at home．I saw her in the street just now．

A．can't                   B．mustn't              C．might                D．may

30．Yesterday，two monkeys escaped _________ the zoo and it made all the people in the zoo anxious _________ them．

A．of；for               B．on；to            C．out；for             D．from；about

29．Computers are very useful．For example，they can _________ sending e-mails．

A．be used as             B．be used to           C．be used by            D．be used for

28．The girl is very friendly，and she is easy to _________．

A．catch with               B．get along            C．go on with             D．get along with

27．Mr. Li said he would come to the meeting．But _________ he won't come?

A．why if               B．even though        C．what if               D．how if

26．There must be somebody _________ into the house．

A．go                    B．comes           C．came               D．coming

25．Tom's brother often goes out _________ permission．

A．at                            B．under             C．without              D．not

24．Gao Dong had to put off the football match _________ the heavy rain．

A．of                        B．with               C．because of              D．since

23．Don't lose your confidence．I believe you will _________ it if you keep trying．

A．lake                  B．live                C．pick                 D．make

22．Look at that volleyball．_________ it _________ you?

A．Does；belong to   B．Is；belong to          C．Does；belong         D．Is；belonging to