Beijing has struggled with smog for years,which has__________ the sun and affected the health and quality of life of millions.
In extreme weather, a worn tyre can break easily ______ it’s mended, as is often the case.
Of all the clues they provided, ______ is of any help for solving the case of robbery.
Boys and girls, make sure you ______ your names on the test paper before handing them in.
Before the ladies ______ the colorful box, filled with things like books, dolls and fancy clothes.
Do you believe drinking a glass of wine every day ______ reduce the danger of heart diseases?