---Answer the doorbell, please. It must be your uncle.
---It Heidi. She’s coming over this morning to help me with my math.
| A．is | B．can’t be | C．could be | D．will be |
I work in a business _________ almost everyone is waiting for a great chance.
| A．how | B．which | C．where | D．that |
Parents always _________ great importance to education. They will do their best to give their children that priceless gift.
| A．attach | B．pay | C．link | D．apply |
---May I smoke here?
---If you _______, choose a seat in the smoking section.
| A．should | B．could | C．may | D．must |
---Do you mind if I open the window?
--- _____. In fact, I feel a little hot as well.
| A．Please don’t | B．I’d rather you didn’t | C．Go ahead | D．Why don’t? |
many times, but he still didn’t understand it.
| A．Having been told | B．Though he was told |
| C．To have been told | D．He was told |