四．听短文，填入所缺的词。（听两遍）                                            

Two brothers go f_____ with a dog. After they come n___ the river, they put their caps on a big stone(石头) and go to the bank(岸) of the river to look for fish. It’s c____, and soon they want to w___ the caps. They tell the dog to go b____ for them.

The dog goes there and tries to take the two caps in his mouth. It’s too d______ for him. The dog s ____ that one cap is big but the o_____ is small. So he can c_____ the two caps at the same time. Look, the dog is very c_____.