You will fail your next exam ______ you start to work hard at your study now.
| A．because | B．unless | C．so | D．if |
—Good morning, class! —___________.
| A．Hello | B．Good morning, Tom |
| C．Good morning, Mr. Li | D．Thank you |
I don’t know the answer. Can you tell me the ______ answer?
| A．basic | B．correct |
| C．wrong | D．deep |
The weather report says it will rain tomorrow, so bring an ______with you.
| A．umbrella | B．book |
| C．shirt | D．tape |
Mark isn't coming to the concert ______ he has got too much work to do.
| A．so | B．because |
| C．but | D．and |
The girl is very friendly. She often ______ at me when I see her.
| A．speaks | B．holds |
| C．smiles | D．watches |