阅读短文，用括号内所给单词的适当形式填空。

       Mr Turner used   1   (go) fishing in the countryside every week. It    2   (be) his

favorite sport. He often fished for several hours without    3  (catch) anything at all.

But this did not    4    (worry) him much. Some fishermen couldn't catch fish.

Sometimes they caught old boots or rubbish. Mr Turner was even worse than the

other fishermen. He never caught anything even old boots. After he   5  (spend) the

whole morning fishing on the river, he always went home with an empty bag. "You

must give up fishing ! " his friends said, "It's a waste of time. ""But they don't   6  

(realize) one important thing. I'm not really   7  (interest) in fishing. I only enjoy   8  

(sit) in' a boat and doing nothing at all. It can make me   9  (forget) the noise of the

city and live quietly for some time, "he always     10   (say) to himself.  

  1.            2.            3.             4.             5.              

  6.            7.            8.             9.            10.         

管孔间孔桥上的裂纹有哪些种类，如何处理？