1 . Madame Curie(居里夫人) contributed all his life ______ radium(镭) so that she has earned respect from people all over the world.

A．to study	B．to studying
C．study	D．studied

2 . According to a recent U.S. survey, children spend up to 25 hours a week _______ TV.

A．watching

B．to watching

C．to watch

D．watch

3 . He used to computer games, but now he is used to       a walk after supper.

A．play, taking	B．playing, taking
C．play, take	D．playing, take

4 . ---Would you like _____ camping with me?
---- I ’d like to. But I’m busy _____ my homework.

A．to go; to do	B．to go; doing
C．going; to do	D．going; doing

5 . He devotes ________to ________.

A．himself; teaching	B．himself; teach
C．him; teaching	D．him; teach

6 . Upon _____ at the airport, we were given a warm welcome by the people there.

A．arriving	B．arrive
C．we arrived	D．arrived

7 .      from the factory forced him to leave his hometown and seek for job opportunities in other cities.

A．His dismissing	B．He being dismissed
C．He dismissed	D．His being dismissed

8 . He is really considering ___himself to ___these children of the poor mountain village.

A．to devote; educating	B．devoting; educating
C．devoting; educate	D．to devote; educate

9 . — I must apologize for _____ ahead of time.
— That’s all right.

A．letting you not know	B．not letting you know
C．letting you know not	D．letting not you know