35.It is said that dogs will keep you _____ as long as you want when you arefeeling lonely.

What do you think of the report about the airpollution on TV last night—I think the situation is so thatwe should take action to protect the environment.

Many students memorize the new words _______ them many times.— Yes. It’s a good idea.

If the opportunity would ______, hold on to it and don’t let it go.

Do you know _______ he turned off the lights or not when he left the classroom?—Sorry. I don’t know.[ ]