How Dave — He is fine.

Pet raisers should look after their pets carefully, _______ they won’t be allowed to keep them any longer.

下面文学常识说法不正确的一项是（ ）

Can I buy a Friday’s air ticket for Washington—I hate to say this, but there are no tickets ______ for Friday’s flight.

I hear Robert has gone to Harvard University for his master’s degree— Oh, how nice! Do you know when he ____?