Tony decided to study abroad _______ he knew he would meet many difficulties.
| A．as if | B．because | C．unless | D．even if |
Just use this room for the time being, and we'll offer you a larger one ________ it becomes available.
| A．as soon as | B．unless |
| C．as far as | D．until |
Everything was placed exactly ________ it used to be before she left the laboratory.
| A．why | B．when |
| C．where | D．though |
________ I'm mistaken, I've seen that tall man at a party before.
| A．If | B．As |
| C．Unless | D．When |
Beijing is ranked first in terms of traffic jams and expenses for culture ________ Guangzhou is more open to peasant workers than Beijing and Shanghai.
| A．when | B．since |
| C．while | D．because |
________ he stops driving himself like this, he'll have a breakdown.
| A．Until | B．Once |
| C．Since | D．Unless |