You _______ seeadentistwhenyouhaveatoothache.

The cat is lost. We are all ________ it.

Paul’s parents were worried that he ____ too much time chatting on line.

Which of the two cameras are you going to buy?—I’ll buyof them，so I can give one to my friend．

I want to know more __________about how to use this word.—You can look it up in the dictionary.