根据句意用所给词语适当形式填空

根据句意用所给词语适当形式填空
__(elephant)walk on tiptoe
do you know that fish __(sheep)with their eyes open?
millie listende__(care)but could not herar anything
how do you go to school when it __(snwo)
the__(long)of the river is 500 kilometres
四.英汉与译
i__________________i can solve this maths problem
他们仔细听,然后听到了奇怪的声音
they____________and_____________
这声音来自于树后的草从中
the noise ______________the bushes__________