home middle school students don't know how （keep） a balance between study and play．
The effect of this kind of medicine needs （far） study before it can be widely used．
What a pity! Sue lost the game because the （weigh） of her shoes made it' difficult for her to run fast．
We all feel （骄傲的） that China put its first homemade aircraft carrier（ 国产航空母舰） in water on April 26， 2017．
My mother goes shopping every week﹣﹣there is a shopping mall just （在..对面） our house．