When asked to explain ________ he does to make his students so fascinated with his lessons, the teacher paused and thought deeply.
| A．what it is that | B．that what it is |
| C．what is it that | D．that what is that |
I promised to get there before 5 o’clock, but now the rain is pouring down.
They ______ for me impatiently.
| A．may wait | B．ought to wait | C．could wait | D．must be waiting |
“The interest ___ be divided into five parts, according to the agreement made by both sides.” declared the judge.
| A．may | B．should | C．must | D．shall |
— Could I borrow your dictionary?
— Yes, of course you ____.
| A．might | B．will | C．can | D．should |
The fire spread through the hotel very quickly but everyone ____ get out.
| A．had to | B．would | C．could | D．was able to |
____caused the accident is still a complete mystery.
| A．What | B．That | C．How | D．Where |