A child who lives in a boring environment will develop his intelligence less than one who lives in rich and varied________.
He spent __________ money on books and _________ his books are about space and satellites.
When I came back from shopping, I found my purse __________.
Mr. Smith, may I have a word with you? I’ll try not to __________ too much of your time.
You may catch up with others __________ you work a little harder.
Without electricity human life __________ quite different today.