He switched off the light and was about to leave the classroom and only then ________ to rain heavily.
| A．did it begin | B．it began |
| C．does it begin | D．it begins |
Do you think ______ important _______ us to learn a foreign language?
| A．that; of | B．it; for | C．this; is | D．that; for |
-----I think it _______ to smoke .
------ _______.
| A．was wrong; Neither do I | B．wrong; So do I |
| C．wrong; So I don’t | D．wrong; So I do |
______ to collage this year, We must study harder than ever before .
| A．Go | B．Going | C．Gone | D．To go |
Don’t have the clock ______ , Your father is sleeping.
| A．rings | B．rang | C．ring | D．ringing |
Nothing but ______.
| A．to leave | B．leave | C．left | D．heaving |