only too ready to help others, seldom, ____,refusing them when they turn to him.

When you meet some trouble about how to use this new kind of machine, you can the instruction.

What’s the matter with Tom?—A letter from his wife ______ an attack of homesickness.[ ]

________the day went on, the weather turned out to be fine.

It’s always foggy these days in our city. That’s really terrible!— Yes, and I hope to plant trees. ______trees, ______ air pollution.