_______ is part of children’s nature. They always insist on getting to the bottom of everything.
| A．Motivation | B．Imitation |
| C．Generosity | D．Curiosity |
. --- What made her unhappy?
--- ___________ in the last exam.
| A．Having failed | B．Fail | C．Failed | D．To fail |
_________ in dealing with such a film, you will be sorry.
| A．Being caught | B．Caught | C．Having caught | D．catching |
_______ very high speed, the rocket rushed into the air and soon disappeared.
| A．With | B．By | C．At | D．On |
If you had finished your homework yesterday, you _____ home now.
| A．will go | B．would go | C．would have gone | D．go |
_____ doesn’t seem to have been any trouble in solving the problem.
| A．It | B．That | C．There | D．He |