He ________ your car by mistake because he didn't have the keys.
| A．mustn't have taken | B．shouldn't have taken |
| C．couldn't have taken | D．needn't have taken |
Obviously they didn’t see the significance of the plan. That’s __________the problem was.
| A．why | B．where | C．that | D．how |
. -----Are you still thinking about yesterday’s game?
-----Oh, that is ____________.
| A．how I feel excited | B．if I feel excited |
| C．what makes me feel excited | D．why makes me feel excited |
. As soon as he comes back, I’ll tell him when ___________.
| A．you will come again | B．will you come again |
| C．you come again | D．do you come again |
Mary _________be late, so don’t wait for her.
| A．would | B．can | C．should | D．may |
Don’t take the lift in a fire because the lift __________ become trapped between floors.
| A．must | B．may | C．would | D．should |