51、light up ——突然快活，高兴起来
　　-Those flowers light up the whole room.

　　52、like apples and oranges ——用来表示无法相比的事物
　　-Which game do you think is more difficult to learn, chess or bridge.
　　They are like apples and oranges.

　　53、look for a needle in a hay stack——大海捞针
　　-We are supposed to meet John here at the train station.
　　That's like looking for a needle in a hay stack (干草堆).

　　54、live by oneself——独自一人生活
　　-Mary said she wanted to live by herself.

　　55、line up ——准备停当，计划安排
　　-I have this great job lined up to manage the closing door clothing store at them all at the mall.——排列起来，排成队
　　-Look at all those cars lined up for the ferry (等待摆渡); There must be forty ahead of us.
　　Yeah, I think it's going to be a while.

　　56、look forward to——盼望，期待
　　-I am really looking forward to the picnic tomorrow.
　　If we are lucky we'll have some sun this year for a change.

　　57、look up to ——把某人当作好榜样模仿，尊重，尊敬
　　-Dianna looks up to her teacher.
　　-I hear your older sister is on the Olympic team and on the honor's list; she must be quite a person.
　　She sure is, I've always looked up to her.

　　58、look over ——检查，查看
　　-The professor asked us to look over our papers for mistakes.

　　59、look into ——调查，审查，研究
　　-Martin is looking into the possibility of getting alone getting a loan(贷款) .