Professor Hawking stepped into the office he knew that there was no hope.

He likes to help others ________ he is very busy.

It is said that by 2010 there will be ______530 million tourists entering Tibet each year.

Information has been put forward _______ more middle school graduates will be admitted into universities.

You may keep the book for one more week _______no one else needs it.

_____ the old man’s sons wanted to know was ____ the gold had been hidden.

Mary felt sad over the loss of photos she had shot in Australia, ______ that was a memory she especially treasured.

He, an average citizen, always thinks of_____ he can do more for the people．

This type of bamboo grows very fast and it will take only three to five years _____ it can be used in various fields .

One Friday, we were packing to leave for a weekend away____ my daughter heard cries for help.