-- When your homework _______, you can.

-- So there is. The WHO says only 1.5 grams of salt _______ for each man every day.

-- Some photos _____by the children of Yushu, Qinghai.

-- I think a bridge ________ over the river.

— It's a cleaner and it           to pick up dirt.

—Yes. But when I got the movie theater, the film _______ for ten minutes.

— Yes, it's always clean and bright because it _________ every day.