The people you find most diffcult can also be your most valuable teachers.
| A．dealing with | B．to be dealt with | C．to deal with | D．being dealt with |
We _______ on this project for four hours. Let’s have a rest.
| A．are working | B．have been working | C．worked | D．had worked |
What the doctor really doubt is_____my mother will revover from the serious disease soon.
| A．when | B．how | C．whether | D．why |
Her name was on the _______of my tongue, but I couldn’t tell it.
| A．point | B．edge | C．top | D．tip |
________her home, Mary helps her mother with some housework.
| A．As soon as she returns | B．On arriving |
| C．After she gets | D．Immediately she reaches |
They often _______their friends at weekends and they always have a good time.
| A．envy | B．interest | C．entertain | D．encourage |