On Halloween, children in American like to _____ as ghosts to frighten people.
| A．dress up | B．put on | C．make up | D．spy on |
Our father often told us in the past that _____is believing.
| A．to see | B．seeing | C．see | D．to be seen |
Is______necessary to change trains at Beijing?
| A．this | B．that | C．it | D．he |
When and where to build the new power station ______ yet.
| A．is not decided | B．are not decided | C．has not decided | D．have not decided |
_____is a good of exercise for both the young and the old.
| A．The walk | B．Walking | C．To walk | D．Walk |
________more attention, the work would have been done better.
| A．Given | B．o give | C．Giving | D．Having given |