Have you ever been to theSports Center ____ is just opened in town?—No, notyet.[ ]

If you want to work for our country in the future,_____ you should have strong body and rich knowledge.[ ]

In China, most people eat rice_____vegetables and meat for meals.[ ]

You ought to have put the milk in the refrigerator, and now ________sour.

have you been married? —For twenty years.