9. Mary clapped her hand over her mouth _______ she realized what she had said.
| A．while | B．as soon as | C．suddenly | D．then |
Rather than _________ on a crowded bus, he always prefers _________ a bicycle.
| A．ride; ride | B．riding; ride | C．ride; to ride | D．to ride; riding |
__________ of the students who took part in the military training is 450.
| A．A number | B．A lot | C．Lots | D．The number |
He realized she was crying ________ his words.
| A．because | B．because of | C．as | D．since |
Mary, ________ here. Everybody else, stay where you are.
| A．come | B．comes | C．to come | D．coming |
The famous film star wore dark glasses so that no one would him.
| A．reach | B．recognize | C．realize | D．know |