If you want to see a doctor, fix the date with him ahead of time. This is a common ___________ in the USA.
A. habit B. law C. rule D. custom
We laugh at jokes, but seldom _____ about how they work.
| A．we think | B．think we |
| C．we do think | D．do we think |
— Mum why do we eat much vegetable
— Because it is ________ to our health.
| A．benefit | B．benefited |
| C．beneficial | D．benefits |
—Tommy，do the dishes.
—Mum，it’s a girl’s job. I would rather ________the floor.
| A．to sweep | B．sweep |
| C．sweeping | D．swept |
—Have you got any particular plans for the coming holiday?
— Yes. ______, I’m going to visit some homes for the old in the city.
| A．If ever | B．If busy |
| C．If possible | D．If anything |
________by the beauty of nature，the girl from London decided to spend another two days on the farm.
| A．Attracting | B．Attracted |
| C．To be attracted | D．Having attracted |