--Is Mary in the classroom? -- No. She______ to the library.
—We must act now because time is _______.—Yes. Let’s start.
―There is too much salt in the Chinese diet.―Right. The WHO says only 1.5 grams of salt ______ for each man every day.
―Which would you like, a hamburger or a sandwich?― _____ of them is OK. I think _______ of them are delicious.
Make a list of the things you want to buy before you go to the supermarkets. ______, you will certainly forget some of them.
―Look at the lady there. ______ it be Mrs. Green?―No, it _______ be her. She left for London this morning.