【题目】Water pipes ______ rusty after a period of use. ( )

【题目】Each time you look at an object, you ______ a picture. ( )

【题目】—Have you gone to see the doctor?( )

【题目】—What were you doing when Anna phoned you? ( )

【题目】A friend of mine returned to his house after a holiday, only to find it ______. ( )

【题目】We had hardly sat down when she ______ plates of food for us. ( )

【题目】My friend ______ here last week, but he couldn’t. ( )

【题目】This is one of the best novels that ______ this year. ( )

【题目】You ought to ______ a test in physics the day before, I think. ( )

【题目】The government ______ to approve the use of widespread surveillance when the Justice Department took objections. ( )