一Climate change________mainly by too much CO 2 in the air．
一So I think the key is to produce electricity without creating CO2
A．is caused B．caused C．causes
—Zhou Ming likes reading English magzines —________. It’s good for English learning
A. So do I B. So am I C.So I do
These_______want to have some fish for lunch ，so they decide to catch many ________
A.Germans；fishes B. Gremans；fish C.Germen；fishes
I want to know ________you will visit Chengdu on vacation
A.whereB.who C.if .
—Toby，would you mind helping me clean the window ？ —_________I’ll do it a minute
A.Certainly B.of course not C.is learning
Mr Zhou always explains well so we can understand his lessons ____________。
A.slowly B. carefully C.clearly