根据句意和语境，用所给词的适当形成填空。

1．English is          (wide)used in the world．

2．Tom sings         (good)in his class．

3．Could you cut the pear into two       (half)．

4．My grandfather often       (use)to take a walk after supper when he was in the countryside．

5．Yesterday afternoon，I met a friend of          (I)in the street．