I wonder how it ________ that they madesuch rapid progress.

Where did you get to know her? — It was on the farm ______ we worked．

s the long March Rocket 2F, as reported, sent Shenzhou VI spaceship into space.

Do you think that man will come to your help?—I really don’t knowa person like him can help me with.

Why didn’t you try your best to get on the bus?一I tried to，but ______ I could，it started moving