According to the latest research, getting enough sleep is _____ to maintaining good health and reducing stress.
| A．essential | B．promising | C．special | D．sensible |
One learns a language by making mistakes and ______ them.
| A．corrects | B．correct | C．to correct | D．correcting |
By the time you have finished this book, your meal ______ cold.
| A．gets | B．has got | C．will get | D．is getting |
—Look at those clouds!
—Don’t worry. ______ it rains, we’ll still have a great time.
| A．Even if | B．As though | C．In case | D．If only |
Don’t handle the vase as if it ____ made of steel.
| A．is | B．were | C．has been | D．had been |
-----I’m more than happy to go out this weekend.
----- ______. We’ve got so much work to do at that time.
| A．Don't worry | B．Forget it |
| C．Don't say so | D．Don't mention it |