The professor said he could talk on _____ interested the audience.
| A．any topic | B．which topic |
| C．whichever topic | D．the topic he thought it |
---How often do you drop your e-pal a line?
---_______, but usually once a week.
| A．It depends | B．As usual |
| C．Generally speaking | D．Have no idea |
Our skin, if ______ to sunlight for a long time, can become darker.
| A．exposes | B．exposing |
| C．being exposed | D．exposed |
_______ he met with the difficulty did he realize the importance of our help.
| A．Never until | B．Even though |
| C．Until when | D．Ever since |
---How’s that? Who broke the glass?
---Well, it ______ me. I was doing my homework the whole evening.
| A．hasn’t been | B．wasn’t |
| C．weren’t | D．hadn’t been |
Don’t be discouraged. ______ things as they are and you will enjoy every day of your life.
| A．Take | B．To take | C．Taking | D．Taken |