—What are you doing, John? Why stop?
—To be on the safe side, we’d fill up the car now for we _______ run out of gas on the way．
| A．must | B．will | C．might | D．should |
---Anna, you look so tired and wet all over!
---Well, you know, all morning I _______ my books to my new office on the third floor.
| A．am moving | B．have moved | C．had moved | D．have been moving |
---It was dangerous to throw that bottle out of the window. You could have hurt someone.
---I’m so sorry! I _______ .
| A．am not thinking | B．wasn’t thinking | C．haven’t thought | D．don’t think |
Tsinghua University, ______ in 1911, is home to a great number of outstanding figures.
| A．found | B．founding | C．founded | D．to be founded |
---May I take this book out of the reading room?
---No, you______. You read it in here.
| A．mightn’t | B．won’t | C．needn’t | D．mustn’t |
---We could invite John and Barbara to the Friday night party.
---Yes, _______? I’ll give them a call right now.
| A．why not | B．what for | C．why | D．what |