简答题 We should encourage him to have confidence in himself.

简答题 There is a large amount of energy wasted due to friction(摩擦).

简答题 John and his brother differ in personality even if their differences in age are not significant.

简答题 He has taught English in this university ever since he moved to this city.

简答题 In an age of plenty, we feel spiritually hungry.

简答题 In no other country in the world can you find such plants as this one.

简答题 Each time history repeats itself, the price goes up.

简答题 Trees need water to grow.