Obviously, the advantage we take of solar energy is ________ enough.We have to work still harder.
For women life sometimes seems ____ it is for men.
____ his homework, the boy went out to play games with his friends.
Guilin is famous ____ its beautiful hills and rivers, while Kunming is famous ____ the Spring City.
Reading English loudly in the morning is good ____ your English study.
He has spent ____ money on his new house.