Mr. Black was old, but able to _______quickly to changes in technology.

In the opinion of many people, body-bombers are forced to do so but ______ many of them are willing to[ ]

Practising Chinese kung fu can not only _____ one’s strength, but also develop one’s character.

One-third of the country _____ covered with trees and the majority of the citizens _____ black people. [ ]

Often he________sit for hours doing nothing at all when he was in low spirits. [ ]