An ecosystem consists of the living and nonliving things in an area __________ interact(互相作用) with one another.
| A．that | B．where | C．who | D．what |
Not only late, he also forgot his book.
| A．had he turned up | B．he had turned up |
| C．he turned up | D．did he turn up |
Was it because of the heavy snowstorm in Europe the flight had to be put off?
| A．which | B．so | C．why | D．that |
The girl standing there looks a bit to me. I wonder if I have seen her somewhere before.
| A．similar | B．friendly | C．strange | D．familiar |
We have phoned her several times, but unfortunately she is still out of .
| A．reach | B．control | C．sight | D．order |
We should do all we can the children who lost the chance to go to school.
| A．help | B．to help | C．helping | D．to be helping |