Do remember to be ________. We must avoid any possible risks when doing this dangerous chemical experiment—burns, poisonous gases or cuts from broken tubes.
| A．cautious | B．thoughtful | C．considerate | D．curious |
The money collected should be made good usethe people in need.
| A．of helping | B．to help |
| C．of to help | D．to helping |
—Shall I give you a hand with this as you are so busy?
—Thank you.
| A．of course you can | B．If you like |
| C．it’s up to you | D．it couldn’t be better |
To their joy, the couplethe house and found the missing ring.
| A．got through | B．went through |
| C．Lived through | D．Looked through |
So absorbedin our talk that my brother took a wrong turn on the way to the airport.
| A．he wat | B．is he | C．was he | D．he is |
If you spit at all, please spit in the bucket(痰孟里)provided
| A．must | B．shall | C．should | D．may |