You have a big mouth,Tom. You have told everybody the secret.
It ________ be the postman at the door.It's only six o'clock.( 2011·江西)
My father insisted that every minute ________ made full use of ________ the work well.
Can you imagine that a smart man like him ________ make such a stupid mistake?
—Did you pass the driving test?—No.I ________ it,but I had little time practising.
—Shall I help clean the kitchen, Mum?—Thank you.But you ________ it because I can do it myself.