The rivers will become dirtier and dirtier ______ we take action to protect them.
| A．since | B．if |
| C．until | D．unless |
Let ______ help _______.
| A．they, you | B．us, your |
| C．her, their | D．us, you |
Bill said they would have _________ holiday.
| A．a three—day | B．three days |
| C．three—days | D．three—day’s |
“What does he do? ” means “____________?”
| A．Who is he | B．Where is he |
| C．What is he | D．What is he doing |
—_______ was Lily born, Lucy? —On June 13th, 1992.
| A．How | B．Where | C．When | D．What |
Who runs ___________, Bob, Tom or Dave?
| A．fast | B．faster |
| C．the faster | D．fastest |