His failure made him aware ___ he had made a great mistake in working out the plan.
| A．of that | B．of | C．that | D．that of |
.
_____ you have a complaint to make, do something about it right away. The longer you wait, the harder it will be to get your complaint resolved.
| A．If | B．Unless | C．Though | D．Since |
.
Mary had to work at evenings and weekends. Only in this way _____ complete the reports by the deadline.
| A．was she able to | B．she was able to |
| C．she has been able to | D．has she been able to |
.
This city, _____ lies in the northeast, was the country’s busiest port from 1648 to 1950.
| A．that | B．which | C．of which | D．where |
.
At least 200,000 people were reported _____ in the ever recorded worst earthquake that struck Haiti last winter.
| A．being killed | B．to be killed | C．killing | D．to have been killed |
.
The symbolic one-hour switch-off first _____ in Sydney in 2007 has become an annual global event.
| A．to hold | B．being held | C．to be held | D．held |