---Sorry, but I can’t visit you tomorrow. ---Come whenever it is to your       .

 —What’s the market ______ of their car in China?—About 18 percent at present.

—Li Lin is very bright and studies hard as well.—It’s no ______ he always gets the first place in any examination.

He put in a special _____ for an extra day's holiday so that he could attend his daughter's wedding.

As we know, too much ________ to Xrays can cause skin burns, cancer or other damage to the body.