There were lots of people _____， and not one of them offered to help.
| A．standing watching | B．standing to watch |
| C．stood watching | D．stood to watch |
.
One advantage of eating a balanced breakfast is _____ it can keep you energetic throughout the day.
| A．that | B．how | C．when | D．whether |
.
_____ 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 |