---How many students are league members in your school?---League members one fifth of the number of the students in our school.
I ________ with my grandma because my parents have gone abroad for further study.
How can they learn much ________ they spend so much time playing computer games?
Cars do cause us some health problems, in fact, far more serious ________ than mobile phones do.
After ________, the litter girl was depressed and kept silent all the day.
The scientist corresponds with colleagues in order to learn about matters ________ to her own research.