___ has already been pointed out is that grammar is not a set of dead rules.

A. As        B. It            C. What          D. Which

____ the standard of living for 3 billion people will create massive opportunities, XiJinping said at the fifth BRICS summit , and he called for major cooperation projects.

A. Improve          B. Improved     C.Improves     D.Improving  

You can make a complaint to the local government ____you are happy with the way things are.

A.unless            B.if           C. once         D. as  

By this time next summer, you ___ a high paying job. I, on the other hand , will still be studying for my degree.

A. will have found    B. will find     C.have found    D.will be finding 

Bob had little idea that his wife was in danger, _____?

 A. didn’t he        B.did he       C.wasn’t she     D. was she