If I ______ plan to do anything I want to，I’d like to go to Tibet and travel through as much of it as possible.
| A．would | B．could | C．had to | D．ought to |
I went to the Lincoln Memorial yesterday, _____, not surprisingly, was crowded with visitors from all over the world.
| A．where | B．which | C．as | D．what |
We are not ready to go into production yet. The new machine isn’t fully _____.
| A．worked out | B．turned out | C．left out | D．tested out |
—Do you know where David is?
— Well, he _____ have gone far — his coat is still here.
| A．shouldn’t | B．can’t | C．mustn’t | D．wouldn’t |
He is my favorite film star. I regard him _____ other stars.
| A．more superior to | B．more superior than |
| C．superior to | D．superior than |
He would have been a doctor 20 years ago, but he _____ to be a teacher.
| A．chooses | B．chose | C．had chosen | D．has chosen |