I am too busy to listen to her ____ talking. She has kept talking for about two hours.

Here is ______ e-mail from my friend.

When I opened the fridge, there ______ only some eggs and a bottle of milk.

The survey shows that 200 students do different things during their vacations. ______ of them take classes according to the survey.

We’re going to have an exam next Friday.—But we’re looking forward _____ next Saturday.