It is difficult for any of us to eat better, exercise more, and sleep enough,________ we know we should.

A. because　　　 B. even if　　　　　 C. unless　　　　　 D. before

The man _______in a blue jacket at the party was a doctor.

　　A. put on        B. dressed         C. had on         D. wore

— Peter, you _____ the window quickly, will you?　

— OK! Oh! The window ____ broken.

A. will shut ; has been　　 B. shut ; is　 C. are shutting ; was　 D. have shut ; has

The wall should be whitewashed, ________ painted white.

A. but　　　　 B. and　　　　 C. or　　　　 D. so

_____ people who buy IBM PC686 is larger than ever before.

A. A lot of 　 　　 B. A number of

C. A great many 　 D. The number of

I’ll never forget the time____ we learned a lot from these workers

　　A. when B. which C. at which D. on which

Maria _____ missed the first train so as to travel on the same one as John.

　　A. deliberately 　　　B. intensively 　　　C. decisively 　　　D. objectively

What a pity! Considering his ability and experience, he ____ better.

A. need have done B. must have done　 C. can have done　 D. might have done

The salesman scolded the girl caught _____ and let her off.

　 A. to have stolen　 B. to be stealing　 C. to steal　　　 D. stealing