—Jane, how long have you been in China? —I _____here two years ago and I _____ in China for two years. A. came; have been B. have been; came C. came; have gone
There are________people who want to travel to China.
—________she________to Singapore before? —Yes.She________there last week.
Last term he had problems________math.
It’s said that________of the water around the world polluted.
She________speak English and Japanese soon.