67. Many countries have sent up man-made communication satellites to _____ the earth, which is made possible for each household to use TV.
Children under six are not ___________to school except those of extraordinary intelligence.
--Oh, must you? Stay a longer. It's been such fun having you --__________. I've got an early start tomorrow morning.
Beijing government puts more than 700 million yuan to increase its green space this year; ____________ doubles the money provided last year.
I can guess you___________ your sweater inside out.
It is only when you nearly lose someone ____________ you fully realize how much you value him.