Though Sundays are _________ as a day for rest, we must make good use of them.
It was about 600 years ago _______the first clock with a face and an hour hand was made.
If you_______ smoke, please go outside.
Every means _________tried but without any result.
Do you wake up every morning __________ energetic and ready to start a new day?
We must keep in mind the fact __________ China is still a developing country.