21. Move a few steps, and the oil-paintings look better ______.
| A．in the distance | B．at once | C．in the open air | D．at a distance |
Can you make sure ______?
| A．that he will come here today |
| B．when he will come here today |
| C．if will he come here today |
| D．whether will he come here today |
The sad mother ______ crying when the reporter asked about her son’s death.
| A．set out | B．broke out | C．burst out | D．gave out |
Because the shop ______, all the T-shirts are sold at half price.
| A．has closed down | B．closed down |
| C．is closing down | D．had closed down |
—What do you think of John?
—He’s a good boy, but he ______ be really stubborn at times.
| A．can | B．might | C．must | D．need |
In order to support his study, his brother can’t wait ______ money.
| A．to earning | B．to earn | C．for earning | D．for earn |