Which of the two English dictionaries will you buy?——I’ll buy ________ of them, so I can give one to my friend Helen.

Boys, don’t lose____ in playing Angry Birds. It is bad for your eyes to play computer games for a long time.

Harvard,_____________ in 1636, is one of the most famous universities in the USA.[ ]

I heard the old man won ______ yuan in the lottery. —Really？What a lucky man!

Billy: I’ve been fixing the computer for over three hours, but it still doesn’t work. Nana: Why don’t you take a rest and try ? Maybe you’ll do better then.