It was about 600 years ago ________ the first clock with a face and an hour handwas made.[ ]

The American Foundation for the Blind hasbeen trying to figure out how to make public libraries __________to blindreaders .

What did Mr．Smith do before he came to China—He in acar factory．

t not been for my teacher’s help, I the first place in the contest.

______ interesting the book is! I want to buy one, too.