1.In the bookshop,a reader asked the shop keeper _____ Who M

1.In the bookshop,a reader asked the shop keeper _____ Who Moved My Cheese was an interesting book.（北京市东城区）
A.that B.how C.what D.if
2.—I don't know _____ Mr.Green will come to see us.
—He will help us with our English.（杭州市）
A.why B.when C.how D.where
3.—We never know _____ the old man is.
—They say he is a teacher.（鄂州市）
A.what B.who C.which D.where
4.I was told _____ Bill Gates was thirteen he began to play with computers.（重庆市）
A.that how B.how that C.when that D.that when