21.____of the machines on display were new items of

　　varieties.

　　A.Secondfive B.Twofifths

　　C.Twofives D.Twofifth?

　　22.It is prohibited by law to mail any merchandise that prove ____in transport.

　　A.dangerous B.dangerously

　　C.in danger D.with danger

　　23.The nectarine is a fruit ____like a peach.

　　A.too B.very C.so D.much

　　24.Harry seldom pays his bill on time, and his brother does ____.

　　A.too B.as well C.either D.also

　　25.Every attention must

　　be paid to him ____he feel that he is inferior to my other guests.

　　A.unless B.because C.so that D.lest

　　26.____relatively costly, the diesel engine is highly efficient and needs servicing infrequently.

　　A.Even B.Even though

　　C.As if D.Since

　　27.I prefer to read ____idle.

　　A.to sit B.to sitting

　　C.than to sit D.rather than sit

　　28.Let us have something iced to drink, ____?

　　A.will we B.shall we

　　C.do we D.don't we

　　29.The time was not far off when he ____this decision.

　　A.has regretted B.had regretted

　　C.will regret D.would regret

　　30.I ____that we would be able to leave tomorrow, but it's beginning to look difficult.

　　A.hoped B.was hoping

　　C.had hoped D.am hoping