Nowadays green food is popular. We need green food and good health,        not all people knew that well years ago. When I was in Grade Seven, my teacher asked us to         something about green food by ourselves. We had no idea at first. Then our four-member group had a        and went to do some research (调查) in a supermarket. Two of us wrote down the names of the        food on the shelves. The other two        customers (顾客) some questions like “Do you know what green food is?” “How often do you        green food?” and so on. More than 30 customers        our questions! Later each group in our class wrote a research report        the topic and handed it in (交上). Our teacher chose the        ones and put them up on the wall of the classroom.        was one of them! We not only learned a lot about green food but also knew how to keep healthy.

A．so B．and C．or D．but

A．learn B．plant C．make D．buy

A．game B．lesson C．discussion D．fight

A．delicious B．green C．fast D．colorful

A．asked B．told C．helped D．answered

A．buy B．sell C．give D．send

A．copied B．asked C．answered D．remembered

A．in B．about C．to D．for

A．long B．short C．bad D．excellent

A．Mine B．Theirs C．Ours D．His