When I try to understand______that prevents so many Americans from being so happy as one m

When I try to understand ________ that prevents

When I try to understand ________ 选择

These teachers try to be objective when they ___ t

Im trying to be more______when I go shopping,and only buying what I really need.A．economyB

My trousers ______ when I tried to jump over the fence.A、crackedB、splitC、brokeD、burst

The government is trying to do something to____better understanding between the two countr