In a time of social reform, people’s state of mind tends to keep ____ with the rapid changes of society.

Your father is sleeping. Please _______ the radio .

are over 58,000 rocky objects in ______ space, about 900 of which could fall down onto ______ earth.

I _______ the dishes for over a week. It’s yourturn. — I ______ you would say something like that.

Mother asked me to take more money _______something unexpected should happen.