Mary clapped her hand over her mouth _______ she realized what she had said.
| A．while | B．as soon as |
| C．suddenly | D．then |
________ too much exposure to wind may cause the
dryness of skin, so too much exposure t
o the sun may result in cancer.
a. Just as b. While c. If d. Now that
It was not yet midnight _____ a stranger asked for a ferry service and promi
sed an extra fare.
a. while b. until c. when d. that
It is important to create an atmosphere _____ wild ideas are honored rather than dismissed.
a. of which b. as c. in which d. when
That was so serious a matter that I had no choice but ________ the police.
a. to call in b. call in c. calling in d. called in
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