How was tea invented—______

Bob, can you read the number 2, 307,018 —Yes, I can. It’s ________.

It’s a long story, but you will find that there are few new words in it .—Good! it will be too hard for children.

Where did you find Mr. Smith? — It was in the library _____ we often went to read. [ ]

I called you this morning, but nobody answered.—I _______ the flowers in my garden at that time.