—If you go hiking in the summer vacation, ______ me a ring. —I will.
—That must have been a long trip. —Yeah, it __________ us a whole week to get there.
—Bob has gone to California. —Oh, can you tell me when he __________?
—I've got to go now. —Must you? I __________ you could stay for dinner with us.
I had been working on math for the whole afternoon and the numbers __________ before my eyes.
The letters for the boss __________ on his desk but he didn't read them until three days later.