— It's so cold! Why are your windows still open?
— Oh, they__________.
| A．aren't closing | B．won't close | C．won't be closed | D．aren't closed |
helicopter can take off and land straight up or down, and can also stay
still inair.
| A．The; an | B．A; the | C．A; 不填 | D．The; 不填 |
--- Don’t leave water while you brush your teeth, honey.
--- Ok, Mum.
| A．run | B．running | C．being run | D．to run |
--- Where did he leave his car key?
--- It was in the lab he made the experiment.
| A．where | B．that | C．what | D．there |
--- Why don’t we take a little break?
--- Didn’t we just have ?
| A．this | B．that | C．it | D．one |
the big snake, the little girl stood under the tree out of her life.
| A．Seeing; frightened | B．Seeing; frightening |
| C．Seen; frightened | D．To see; frightening |