What’s the matter—Something is wrong with my _______. I can’t seeclearly.

The Spring Festival falls ________ the first day of the Chinese Lunar year

Many students signed up for the _________ race in the sports meeting to be held next week.

It’s smoggy these days. That’s terrible!—Yes, I hope to plant trees. ______ trees, ______air pollution.

There aremany books on the shelf. But only one of them is ______.