I tried to work on, but I was so tired that I could no longer ___.

       A. hold out    B. keep out   C. stick to     D. insist on

The grammar book she ___ was not in the library.

          A. turned to     B.looked up     C.look through      D.referred to

The bad weather meant__________ the rocket launch or 48 hours,．

A.delaying                       B．having delayed 

C.to delay                       D．to have delayed

You must have waited here for a long time ,___________you?

A. mustn't    B. didn't        C. haven't       D. hadn't

Every minute is made full use of __ at our lessons.

        A. to work      B. working     C. having worked      D.being worked

----What can I do for you?

        ----I’d like to buy a present for my teacher’s birthday, ___ at a proper price, but of great value.    

        A. that           B.one        C. it        D. everything

—The twins will fly to New York with their parents this evening?

       ---No.In fact, their plane ___ from Shnaghai ahead of time.

       A. has taken off    B.will take off   C.is taken off     D.is being taken off

---Which of those English-Chinese dictionaries do you like most?

         ----______.They are both expensive and of little use.      

A. None        B.Neither        C.All         D.Both

— I am sorry to hear that your mother is ill in hospital.

— ____.

A. That’s all right

B. You don’t have to be so sorry

C. It is nothing

D. It’s very kind of you

Leonardo da Vinci ________ birds kept in cages in order to have the pleasure of setting them free.

A. is said to be buying   B. is said to have bought

C. had said to buy      D. has said to have bought