__________ environmental damage is done, it takes many years for the ecosystem(生态系统) to recover.
A.Even if | B.If only | C.While | D.Once |
He is really a friend of mine. He would _______his last penny with me.
A.cost | B.lend | C.gave | D.share |
The Smiths are going ______ separate holiday ___________.
A.in; in a week | B.on; after a week |
C.on; in a week’s time | D.during; a week away |
you had better drop your parents a ________ in case (以防)they are worrying about you.
A.message | B.news | C.letters | D.line |
If you are left _______ on a _________land, how will tou make a living?
A.lonely; deserting | B.alone; deserting |
C.alone; deserted | D.lonely; deserted |
He studies in the evening instead ________ the day.
A./ | B.of | C.of during | D.of on |