The teacher won’t begin the class ______ all the students ______.
| A．until ; stop to talk | B．until; stop talking |
| C．if; stop to talk | D．if ; stop talking |
______ regular exercise is very important, it’s not a good idea to exercise too close to bedtime.
| A．If | B．As | C．Although | D．Unless |
The box is ________ heavy ________ I can’t lift it.
| A．too, to | B．so, that |
| C．very, that | D．too, that |
We're not sure if it _______ tomorrow. If it _______, we won't go hiking.
| A．will rain; rains | B．will rain; will rain |
| C．rains; rains | D．rains; will rain |
If it ________ tomorrow, we will go to the zoo.
A. isn’t rain B. doesn’t rain C. won’t rain
——What do you think of our school basketball team?
——They’re going to lose the match __________ they improve their skills.
| A．unless | B．until | C．if | D．as |