Rewrite each of the following sentences in another way so that it means almost the same as the sentences printed before it : 
1 the exercise was so difficult that we couldn't do it
->it was ...................
2 he is sorry he is not able to speak English well
-> he wishes............. 
3 Tom passed the test easily
-> Tom had no ...........
4 My friend cannot run as fast as me
-> I can ............