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The young dancers looked so charming in their beautiful clothes that we took _____pictures.

If parents have children help with housework, the children will feel needed. ______, they will learn to take care of themselves.

______ has an internal clock that regulates the beating of our hearts, and the ______ of our breathing.

I can't say which wine is best---it's a(n)_______of personal taste.

21st Century School Edition is ____ a newspaper. It helps us to improve our English a lot.

The _______ of students in our class are from the country; only five are from cities.

—Do you need any help，Lucy?
—Yes.The job is________I could do myself.

If parents have children help with housework, the children will feel needed. ______, they will learn to take care of themselves.  

______ has an internal clock that regulates the beating of our hearts, and the ______ of our breathing.

Cultural exchange ______ better understanding between people in different countries.