_________ no doubt that a green campus plays an important role in the growth of students, both physically and mentally.

Some of my friends are interested in science, but none of them can tell ____________.

____ early，and you won’t be late for school．

Many birds are out of ____________ now, because we have done a lot of things to protect __________ birds.

Will Mr Brown come to visit the company ?—We don’t know if he _______．If he ______，we’ll tell you．