根据下列句子的意思,用括号中所给词的正确形式填空，每空限填一词。

1．He is going to celebrate his ___________ （forty） birthday this Saturday．

2．Jim is fond of sports now, so he is much ___________ （healthy） than before．

3．It’s hard to give up ___________ （smoke）, but you have to．

4．Before making an important ___________ （decide）, think it over．

5．Computers are _________ （wide） used in our daily life．