Mrs. Black doesn’t believe that her son is able to design a digital camera, ______?[ ]

_____is known to us all is that the old scientist, for____ life was hard in the past,still works very hard in his eighties

l as teaching soccer’s basic skills and rules, the introduced textbooks will ______team spirit and sense of responsibility.

If you are able to talk to a friend over the telephone, you feel that you are close _____ the actual distance is not shortened

What about the price of petrol now? — It has been ______ 20 percent since the beginning of this year