We have been informed of the strict rules _____ for garbage sorting in the near future.
A.adopted B.to adopt C.to be adopted D.having adopted
The harmful effects that smog can have on people's health are one of the top ______ of those who live in some cities.
A.concerns B.conflicts
C.characters D.charges
You’d better communicate with each other sincerely, and I hope to see your conflict ________ tomorrow.
A.was to be solved B.has been solved
C.will have been solved D.had been solved
1 have one regret about the time I spent in high school: I _______ more advanced classes that are really helpful in college.
A.couldn't have taken B.should have taken
C.needn't have taken D.must have taken
It wasn't until I ______ took part in the activity that I understood the meaning of it.
A.actively B.personally
C.rarely D.normally
My skating teacher was really great and ______ I knew it, I was able to skate!
A.before B.since
C.until D.after
