In the 16-19 age group,1 of women smoke ______ 8 of men.
_____ all my teachers, Mr. Moore is the one who impresses me most.
Hurry up!The train ______. You know it ______ at 8:30 am.
In recent days ,with the help of our teacher , I have made ___ great progress in _____mathematics.
Mrs. Green always helps her mother even though going to work _________most of her day.
We have to admit that the biggest___________ facing the ecosystem is limited resources and the worsening environment.