Is Mr. Green in the office?—No, he ________ be in the office. Look, thelight in the office is off.

Can you join us in the party this evening?—Well, that depends on________I can have my report done before then.[ ]

—Will you lend me some paper?—Sorry, mine ______.[ ]

How I wish I ___ your advice when you first warned me.

I’mgoing to the United States —How long ______ you ______ in theUnited States