655. Legal tender is any type of money that must, _______, be accepted in a payment of a debt.

A. law　　　 B. by law　　 C. its law　　　　 D. which law

654. The subject of these lectures _______ by the lecture committee.

A. announces　　　　　　　 B. have been

C. announced　　　　　　　 D. has been announced

653. – I’m leaving now.

　 --- Make sure ______ the door.

A. for you to lock　　　　　 B. to have locked

C. of locking　　　　　　　 D. you lock

652. I could just see a car in the distance, but I couldn’t _________ what color it was.

A. make out　 B. look to　　 C. look out　　 D. take in

651. When the fire broke out, __________.

A. the house became emptying　　 B. the house had empties

C. the house had emptied　　　　　 D. the house was made empty

650. – Why are you unhappy?

　 --- The other students made ________.

A. of me the fun　　　　 B. fun of me

C. fun with me　　　　　 D. with me the fun

649. We don’t sell foreign newspapers because there is no _______ for them

A. request　　 B. claim　　 C. requirement　　 D. demand

648. – You were late again this morning.

　 ---I think you had better _____on.

A. to start to be　　　　 B. start being

C. started being　　　　 D. to be

647. – What were you doing when she called?

　 ---I had just finished my work and ________.

A. was starting to take a bath　　　 B. was started to take a bath

C. to start to take a bath　　　　　 D. starting to take a bath

646. It is I who _______ on duty today.

A. am　　 B. are　　 C. is　　　 D. has been