Drivers are warned that it is dangerous to talk on the phone while________.
| A．drive | B．driving | C．drove | D．to drive |
The man pulled out a gold watch, _______ the hands were made of small diamonds.
| A．of which | B．of whom | C．whose | D．of them |
Thecleverboymadeaholeinthewall,_____hecouldsee_____was goingoninsidethe house.
| A．which;what | B．throughwhich;what |
| C．throughthat;what | D．what;that |
---Do you have anything to say for yourself?
---Yes, there is one point ________ I must stick to.
| A．/ | B．when | C．why | D．where |
The thief went into the house at midnight, only ______ by the policemen hiding there.
| A．to catch | B．catching | C．to be caught | D．caught |
In spite of the great difficulties, Helen Keller ______ studying and finally succeeded.
| A．stuck to | B．kept up with | C．kept on | D．insisted on |