因為的單詞怎麼寫英語單詞

　　His school work is suffering because of family problems.

　　由於家庭問題，他的學業日漸退步。

　　Two players are out of the team because of injury.

　　兩名隊員因傷退出了比賽。

　　Why get upset just because you got one bad grade?

　　何必因為一次成績不好就想不開呢？

　　No payments were made last week because of a computer error.

　　由於計算機出錯，上週未付任何款項。

　　She found it difficult to make friends because of her natural reserve.

　　她因天性矜持很難交到朋友。