We travelled together as far as Chicago, ______ we parted.
| A．when | B．which | C．why | D．where |
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 |
She is making herself ill with _____ over her son's future.
| A．trouble | B．annoyance | C．disgust | D．worry |