Many nations have promised to reduce greenhouse gas emissions, but are falling short of the _______ reduction of 25 to 40 percent of 1990 levels.
I have ________ French. What about you?
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.