—They are quiet，aren't they?
—Yes.They are accustomed ________ at meals.

________ the meeting himself gave them a great deal of encouragement.

The flu is believed ________ by viruses that like to reproduce in the cell inside the human nose and throat.

—Is Bob still performing?
—I'm afraid not.He is said ________ the stage already as he has become an official.

I like getting up very early in summer.The morning air is so good ________.

When I handed the report to John，he said that George was the person ________.

In my opinion，life in the twenty－first century is much easier than ________.

—What's the matter with Della?
—Well，her parents wouldn't allow her to go to the party，but she still ________.

The patient was warned ________ oily food after the operation.

The man we followed suddenly stopped and looked as if ________ whether he was going in the right direction.