After starting work, Cao spent his evenings _____ in his books and was eventually admitted to a secondary technical school.
—Shall we meet tonight?—Sorry, I’m busy. How about________ day?
We left the meeting, there obviously __________ no point in staying.
_________ expressing her love for you, my sister has also expressed mine.
You’re watching TV? You’re ___to be cleaning your own room.
The design __________all the ages and social groups is not easy to make.