We see the lightning ____ it happens, but we hear the thunder later.
Let’s have another look, ___?
I __ brushing my teeth twice a day.
Dr, Robert Bell went to New York , bought some books ___ his daughter. A. visiting B. to visit C. and visited D, visited
His cousin will stay in Beijing till his aunt ___ well.
I’ve thrown away my old trousers, I’ll have to buy ___.