As many as 150 miners died in the accident．If only the mine - owners ____ enough attention to the safety measures!
| A．paid | B．should pay | C．would pay | D．had paid |
—When did he leave the classroom?
—He leftyou turned back to write on the blackboard.
| A．the minute | B．the time | C．until | D．before |
he thought he was helping us with the work, he was actually in the way.
| A．Although | B．Unless | C．Because | D．When |
Hearing his words ,I couldn’t decide or remain .
| A．whether to go abroad | B．if I go abroad |
| C．if to go abroad | D．to go abroad |
Questions and exercises are given by the computer, which decides ______ to move the students ahead, review an easier level, ____ give more work on the same level.
| A．either, or | B．both, and . | C．whether, or | D．not only, but also |
—Will you go to Mary’s birthday party?
—No, ____ invited, I can’t go to it. I’ll be too busy then.
| A．if | B．unless | C．even though | D．when |