Students should learn how problems.
If the green light isn’t on, ___________ a minute.
— Is that Jack speaking?—Sorry, he isn’t here. He ________the cinema with his aunt.
— Another cup of tea?— No, thanks. I _______ be off. My mom is waiting for me at home .
— The land in the southwest of China is in great need of _______.— Yes,it hasn’t rained for a long time.
—The food in that restaurant is delicious. I took lots of photos with my cell phone.—Really? Could you show ______ to me?