I've been considering _______ my job as a teacher because a teacher is often considered _______ a gardener.
| A．to change; to be | B．to change; being |
| C．changing; being | D．changing; to be |
The government announced that six highways by the end of last year.
| A．built | B．had built | C．have been built | D．had been built |
. As a result of destroying the forests, a large ___ _ of desert
___ covered the land.
| A．number; has | B．quantity; has | C．number; have | D．quantity; have |
Is this science lab ___ some foreign experts visited last Friday?
| A．that | B．where | C．which | D．the one |
.Being examined twice a year is the rule that every driverobey in the city .
| A．shall | B．can | C．ought to | D．need |
_ we left the building that I realized how dangerous the situation had been.
| A．Only then | B．It was only then | C．Only after | D．It was only after |