The classroom is ______ clean ______ it wasyesterday.— Sorry, I forgot to clean it.

I’m still working on my project.—Oh, you’ll miss the deadline（截止期限）. Time is________.

If all of us give ________ helping hand, our world will be ________ better one.

Neither side is prepared to talkto_________unless we can smooth things over between them.

People have cut down many trees every year,so there will be fewer trees, ________