You _____ be 18 years old before you are allowed to drive a car ,and it’s also essential to get a driver’s license
Do you think it necessary that we have all the chairs_________?
________do you think _________ the monitor of our class?
.We were about to go downstairs when the lights_________.
.Jack couldn’t answer the question_________ got the money.
—You did so much work today.You must be very tired. —No,I’m not_________tired.