Glass is a wonderful substance. It can (19) ____ over and over again., A. be recycle, B. recycle, C. recycling, D. be recycled, Imagine how (20) _____ bottles of soda, juice, and glass jars (21) ____ used daily., A. much, B. many, C. too much, D. more, Imagine how (20) _____ bottles of soda, juice, and glass jars (21) ____ used daily., A. are, B. is, C. be, D. being, If we simply throw them (22) ____ , the environment will suffer greatly., A. out, B. away, C. in, D. off, There are many (23) ___ of glass recycling., A. drawbacks, B. reasons, C. advantages, D. disadvantages, (24) ____ benefit is the recycling of glass conserves natural resources., A. Others, B. A, C. Other, D. Another, We will use recycled products. We will save money., A. If we use recycled products, we will save money., B. We use recycled products if we will save money., C. We will use recycled products if we save money., D. If we use recycled products, save money, We will plant more trees. The air will be fresher., A. If we plant more trees, the air would be fresher., B. If we will plant more trees, the air will be fresher., C. If we plant more trees, the air will fresher., D. If we plant more trees, the air will be fresher., We/ help/ protect/ environment/ if/ use/ paper bags., A. We will help protect environment if using paper bags., B. We will help protect environment if we use paper bags., C. We help protect environment if we will use paper bags., D. We help protect environment if we use much paper bags., If/ we/ use/ buses/ we/ reduce/ pollution., A. If we use buses, we reduce pollution., B. If we use buses, reducing pollution., C. If we use buses, we will reduce pollution., D. If we will use buses, we will reduce pollution., 29. , A.Keep calm, B.Go upstairs, C.Walk fast, D.Step up, , A.No crossing, B.No parking, C.No smoking, D.No littering.

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