The world is changing fast. I strongly believe that one will easily fall behind he keeps on learning.
A. unless B. if C. when D. as
His speech at the meeting was really wonderful, and it could never be any .
A. best B. better C. worse D. worst
All the indicate that he has been deeply involved in the crime.
A. evidence B. fact C. factors D. cause
—Are you free after school?
—Sorry: I’ve planned to treat a friend of mine to dinner for his help.
A. in terms B. in honor C. in turn D. in return
—Alice, you look puzzled. Have you understood it?
—Yes, I another problem just now.
A. have thought of B. am thinking of
C. had thought of D. was thinking of
Whether ways will be found to stop pollution or not is just worries the public.
A. why B. which C. that D. what
