If we don’t do ______, soon giant pandas will die.
—How many workers are there in your factory, Mr Brown?—________ workers in our factory _________2000.
______ time went by, Cindy and the other kids became good friends.
Hearing the bell , all the students stopped to_________ their books , ready to go back home.
—I think the film Lost in Thailand is more wonderful than Life of Pi.—No, I think Life of Pi is _________ Lost in Thailand.
—Are you ________ that you can fix the bike ________?— Sure, I’m good at DIY.