21. China and other countries found that even when children from the countryside to start school, they have a(an) ______ to be absent and often drop out later.

A. reaction            B. expectation               C. restriction                 D. tendency

22. ______ branch fell from the tree and hit her on ______ head in the thunderstorm.

A. A; the               B. The; the                   C.A; /                          D. The; /