______of the earth ______ covered by water.A. Two thirds; is B. Two thirds; are C. One thirds; is
Keep studying hard and you’ll make great sooner or later.
The workers succeeded producing all the machines in a month.2
_______ cross the road before the traffic lights turn green .
---- _______ you ______to the United States ?-----No , never , but I went to Canada a few years ago.
Let’s _______ a talk about learning Chinese .