As soon as his teacher begins lecturing, he begins to doze off, not intentionally but _____.
| A．personally | B．randomly | C．habitually | D．unconditionally |
. I support your decision, but I should also make it clear that I am not going to be _____ to it.
| A．connected | B．fastened | C．bound | D．stuck |
John _____ knowledge of radio just by staying around the radio station.
| A．caught on | B．worked up | C．took up | D．picked up |
| A．densely | B．soundly | C．loudly | D．noisily |
They did not find _____ to prepare for the worst conditions they might meet.
| A．worth their while | B．it worthwhile |
| C．it worth | D．it worthy |
The microphone enabled them to keep in touch, in other words, it made it _____ for them to contact each other.
| A．likely | B．capable | C．possible | D．probable |