The background music in an assembly line is designed _______________(不被听到).

填空题Today the public is much concerned about the way _______________(大自然正被毁坏).

填空题_______________(无论你是为了吃而活着还是为了活着而吃), food is a major expenditure in every, family’s budget.

单项选择题A．Jeff has always liked his sister.B．Jeff made a phone call to-his sister.C．Jeff visited his sister.D．Jeff planned to visit his sister.

填空题increasing

填空题Only under special circumstances _______________(大一学生才被允许)to take make-up tests.