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Another truly wonderful aspect of the Internet is the way _______ to build social ties.

It was said ______ was all ______ he said.

. ______ the ancient Egyptians built the pyramids puzzled people for centuries.

The difficulty we now meet with is ___________ we can persuade him to tell the truth.

It was in the remote mountain areas ______ I spent the gap year ______ I learned how to work with a group of strangers and how to look after myself．

I was born in New Orleans, Louisiana, a city        name will create a picture of beautiful trees and green grass in our mind．

Being determined is a kind of quality and that’s ________ it takes to do anything properly.

The one concern for parents and students is _______ the student pursues their university education in a foreign country, the student will not have the opportunity to establish social contacts in China.

. I don’t know ____ that you stay here.

. _______, he always tries his best to complete it one time.
A However the task is hard            B However hard the task is
C Though hard the task is              D Though hard is the task