________ some teenagers don't realize is ________ difficult life can be after they get addicted to drugs.
| A．What; what a | B．That; how |
| C．What; how | D．That; what |
Every day ____ a proverb aloud several times until you have it memorized．
| A．read | B．reading |
| C．to read | D．reads |
A good listener takes part in the conversation,offering ideas and ______ questions to keep the talk flowing．
| A．raising | B．understanding |
| C．copying | D．solving |
____under the tree was a charming girl aged about seventeen or eighteen．
| A．Sat | B．Sitting |
| C．To sit | D．Sit |
—Will you attend the meeting this afternoon？
—But I ________ told anything about it．
| A．haven't been | B．am not |
| C．wasn't | D．won’t be |
He wrote a long letter ______ he explained what had happened in the accident．
| A．what | B．which |
| C．where | D．how |