When he knocked at the door, my mother was busy ____ supper.
| A．preparing for | B．in preparing |
| C．to prepare for | D．to prepare |
---- Don't you think it necessary that he _______ to Miami but to New York?
---- I agree, but the problem is ________ he has refused to.
| A．will not be sent; that | B．not be sent; that |
| C．should not be sent; what | D．should not send; what |
—What are you going to do this afternoon?
— I will probably play computer games ________ my parents are out.
| A．as far as | B．as long as | C．even if | D．as if |
________ you’ve got two film tickets, you may as well invite Mary to go with you tonight.
A Now that B After all C Although D As soon as
In time of serious accidents，____we know some basic things about first aid，we can save lives.
A whether B. until C. if D unless
He tried his best to solve the problem，_____difficult it was.
A however B. no matter C. whatever D. although