He gave us another piece of advice, ________ of great help to the research work.
You _____ her in her office last Friday, she’s been out of town for two weeks.
Our success was largely _____ the good cooperation of all team members.
. In our country, it’s a practice that workers have _____ for the Spring Festival.
They are forbidden _____, for they are still middle school students.
We have the most population in the world, most of it _____ farmers.