用所给词的适当形式填空

小题1:Ms Ba sometimes watches her students having fun ___________ (play) on the playground.

小题2:Go ___________ (cross) the bridge, you can see a tall tree with many flowers on it .

小题3:Children often enjoy ___________ (they) at school .

小题4:Sheep like to eat grass and ___________ (leaf).

小题5:Please ___________(be) quiet when you are with pandas in the zoo.

小题6:We sometimes listen to some ____________(relax) music when we’re tired.

小题7:Hunan Street is a good place ____________ (have) fun..

小题8:I like elephants because they are so ____________(beauty).

小题9:Are ___________(thief) afraid of the police? Yes, very much.

小题10:Do you think koalas are very ___________(friend) to people?

钢轨引接线塞钉孔距钢轨连接夹板边缘应为（）mm左右。引接线的裸线部分不得与箱、盒金属体（）。