It’s a fact ____ he has not received the letter.

More strict measures should be taken____more people are infected with the virus of H1N1 flu.

—You see, I’m poor in physics and you are not good at chemistry, and……
— That’s _______ we should help each other.
A. when               B where              C. how            D. what

—You missed the train?
—Yes.      I had gone by taxi.

You may use my office as you like,        you clean it up afterwards.

New tombs found in Giza support the view that the Great Pyramids were built by free workers and not slaves, ______ widely believed, 

______ is expected, according to the online survey, is _______ prices of houses
will not go up an more.

The experiment turned out to be very successful，         was more than we could expect．

I don’t doubt           our team will the win 4×100一meter race．

Katy has lived in New York for several years．she doesn’t get used to the life there