I would have attended your birthday party last night but for the fact that itat that time

Most of us value our time, but some of us treat it ________ it had no value at all

Every possible means ________ to prevent the air pollution，but the sky is still not very clear

30.— Hello! Golden Bay Ressort! Can I help you? — Do you have a room _____ for this weekend?

There are many insects in the world that never do _______ harm to human beings.