--Life ____   be very hard for people living in the north of Canada as it is very cold there in winter.—Yes, the weather there _____   be as low as 60℃ below zero.

He _______ have taken your car by mistake because he didn’t have the keys.

We used to work in the same office and we____ often have coffee together, which I missed so much years later.

You had better ________some food and drinks before the field trip ________.

—Can I pay the bill by check?—Sorry，sir．But it's the management rules of our hotel that payment     be made in cash．