— I know this is the latest type but it's second- handed. $20 — that's my last offer.
— OK. It's a (n) ___________.
| A．bargain | B．trade | C．agreement | D．deal |
---Did you remember to take the key to Tom?
---Yes, I gave it to him ________ I saw him.
| A．while | B．once | C．suddenly | D．the first time |
It is ________ world of wonders, ________ world where anything can happen.
| A．a; a | B．a; the | C．the; the | D．the; a |
Father ________ for London on business upon my arrival, so I didn’t see him.
| A．has left | B．left | C．had left | D．was leaving |
The boy’s dream was to have his own laboratory ________ to try out some of his own ideas.
| A．from which | B．in which |
| C．by which | D．at which |
There is a common belief among them ________ rubbish can should be put to good use.
| A．which | B．what | C．whether | D．that |