To our _________, Hawking didn’t worry about his problems in the slightest, _________, he just face the problems.

Can your sister play tennis– Sure. She plays ____ I do.

IsGuo Peng your brother—Yes,he is______brother.

No one knows ______effects the GM material might have on the food chain.

Who is the girl stanging over there —Well,if you_______ know,her name is Kate.