. The government has taken some measures to solve the shortage of electricity, but it may be some time _________ the situation improves.
| A．since | B．when | C．unless | D．before |
_______in her office for nearly 20 hours, she is going home to have a rest.
| A．To work | B．Working | C．To have worked | D．Having worked |
Tomorrow, our ship will set sail for Macao.
| A．However the weather is like | B．However is the weather like |
| C．Whatever is the weather like | D．Whatever the weather is like |
Many people believe we are heading for environmental disaster（灾难） _______we radically（根本地） change the way we live .
| A．but | B．though | C．unless | D．in case |
It’s a long trip and we’ll have to ___________ early tomorrow morning .
| A．start off | B．go off | C．take off | D．put off |
The way you thought of _________ the work is very good .
| A．doing | B．to do | C． that do | D．which to do |