完成句子（共5小题；每小题2分，满分10分。）
The manager used to sleep for _______________________________ (不足6小时) a night, which made him very tired.
The Lis are vegetarians. They buy __________________________ (两千克胡萝卜) every week.
I haven’t decided what present to buy for her birthday. But it must be something ___________
________________ (不同于他们的).
The mother often felt unhappy because her son ______________________________ (不像邻居家的那样高).
The boy has been told that if he stops repeating such an action, he ______________________ (不必害怕) anything.