_________the exams to worry about, I have to work really hard this weekend.
| A．As | B．For | C．With | D．Because of |
A hot balloon blew up in Egypt. There ________ something wrong with the quality of it.
| A．may have been | B．must be |
| C．need have been | D．might be |
There was something wrong with the network, or the email ________ earlier.
| A．could have been sent | B．might be sent |
| C．need have been sent | D．must be sent |
—________ you leave now? You only arrived an hour ago!
—Sorry, but so much homework is waiting for me.
| A．Must | B．May |
| C．Can | D．Might |
The parcel was a whole week late. How I wish I ________ air mail instead.
| A．had chosen | B．would choose |
| C．chose | D．choose |
—Could you please have my car ready today?
—Sure, the damage is not that serious, so it ________ be ready by 5：00 pm.
| A．should | B．could |
| C．might | D．need |