We tried to find a table for seven, but they were all （ ）.

They were talking （ ） while preparing dinner.

Mary didn’t say （ ） she would return, but I believe she’ll be back for dinner.

（ ） when she started complaining.

The reason is （ ） he is unable to operate the machine.

I must tell you how _____ a letter from you.

By the time the course schedule is completed， we _____ the basic subjects of French.

I've been playing tennis with Mary. But I was _____ by her.

The chemical factory was pulled down _____protecting the environment.

（ ） relatively costly, the engine is highly efficient and needs servicing infrequently.

He was never （ ） of experimenting with different ways of planting his crops.

（ ） born in Chicago, the author is most famous for his stories about New York City.