Those boys didn’t start the work ________ their teacher came back.
| A．until | B．while |
| C．as soon as | D．if |
---______have you stayed in this hotel?
---Not long; just_______this Monday.
| A．How often; on | B．How long; since |
| C．How soon; from | D．How many days; for |
Remember to get to the point, ________you talked, ________attention he would pay to you.
| A．The more; the less | B．The more; the fewer |
| C．The most; the least | D．The most; the fewer |
______the problem clearly, Mary has to look for lots of information.
| A．To explain | B．Explaining |
| C．Explain | D．Explained |
As children_______, they learn from their experiences and form a picture of what the world is like.
| A．set up | B．grow up |
| C．wake up | D．come up |
I don’t know if he_______, if it_______tomorrow.
| A．will come; rains | B．comes; rains |
| C．will come; will rain | D．comes; will rain |