It is difficult for any of us to eat better, exercise more, and sleep enough, ______ we know we should.
During Christmas, people get together and sing Christmas songs for _________.
Some _________ are flying kites near the river.
After the exam, we'll have________ holiday.
They are those _________ bags.Please put them on the bus.
--- How many workers are there in your factory? --- There are two ___________.