41. _______ ______ _____ (曾经), people use silk as paper.

40. 纸是由木材制成的。Paper is ______ _____ wood.

39. Every evening my mother ______ ______ (浏览)magazines at home.

38. 这块电池一个星期没充电了。The ______ hasn’t been _____ for a week.

37. Don’t worry! I’ll ______ ______ (负责)that.

36. I haven’t seen you for ______ _______ ______ ______.(几个月)

35.书能被电脑代替吗？Can books ______ ______ by computers?

34. Paper and printing have been used _______ _______.很久

33. It’s going to be an online magazine ______ ______ ______.(从现在起)

32. 我想在学校去参观博物馆时照一些照片。

I’d like to take some photos _____ ____ ______ ____ the museum next week.