--- Congratulations! ---Thank you. If it hadn’t been for your help, we ____ in the experiment.
Hand in hand with reading, Dave ____ the habit of making notes.
In the past few years, Chinese scientists ________ great success in the field of space flight.
History is _______ a subject which only lets us know something in history..
I’m ____your class today so you must do ____ I tell you.
—When will Mother come back?—She _____ to be here by eight o’clock tonight.