Beijing was under an “orange” smog alert on Feb. 24, which marks the first time the second-highest warning level of a new system introduced last year_______.
(2012年江苏南通调研)The traditional approach ________with complex problems in our studies is to break them down into smaller,more easily managed problems.
Don't ________for granted that he will keep his promise.
I hope you’ll ________what I'm going to tell you.
The opposition have demanded that all the facts ________public.
Helen always helps her mother even though going to school ________most of her day.