On Halloween, children in American like to _____ as ghosts to frighten people.
| A．make up | B．put on | C．dress up | D．spy on |
I was at a loss what to do next when an excellent idea __________ me.
| A．occurred to |
| B．happened to |
| C．knocked to |
| D．knocked at |
When he smelt the coming of the tough economy, he changed his lifestyle a lot. __________ he wanted to be out of the money trouble that is to appear later.
| A．Generally |
| B．Apparently |
| C．Luckily |
| D．Immediately |
(2012·北京) Jerry did not regret giving the comment but felt he could have expressed it differently.
| A．why |
| B．how |
| C．that |
| D．whether |
(2012·安徽) The limits of a person's intelligence, generally speaking, are fixed at birth, but __________ he reaches these limits will depend on his environment.
| A．where |
| B．whether |
| C．that |
| D．why |
It suddenly occurred to him __________ he had left his keys in the office.
| A．whether |
| B．where |
| C．which |
| D．that |