Mary, stop to have a rest. You ______ the flowers in your garden for nearly two hours.

A. are watering    B. were watering      C. water              D. have been watering

—Which of the ipads do you like most?

—________. They are both expensive and of little use.

A. Either　　　 B. None　　　　　 　 C. Neither　　　　 　 D. Any

 If you had brought your swimsuit with you, we ______ swimming in the lake now.

A. could go       B. could have gone        C. can go         D. have gone

 _______ herself to listening to music, the girl cared little about any other things.

A. Devoting      B. Devoted          C. Having devoted      D. To devote

 The elderly need special care in winter as they are _______ to the sudden change of weather.

A. sensitive       B. reliable          C. flexible             D. positive

 Group-buying websites have appeared ______ as agents between buyers and sellers.  

A. served        B. serving          C. to serve              D. having served

—Didn’t they come to the party last week?

—Yes. They didn’t want to come with us at first, but then we ______ persuade them.

A. would　　　　 B. could　　　　　 C. were able to　　　 D. had to

 Ring me at 5 am? No, not that early! I _______.

  A. sleep        B. will sleep         C. have been sleeping      D. will be sleeping

—Is it OK if I take away this book?

—_______.

A. No, you don’t　 B. No, it shouldn’t　 C. I’m afraid not　 　D. Don’t take it

—Hi, Lydia. Are you going to the concert on Friday?

—I’d like to. But there are so many problems _______.

A. remaining to be settled　　　　　　　 B. remained settling

C. remaining to settle 　　　　　　　　 D. remained to be settled