—There has been less and less pollution in Leshan these years.
—The government has made a great effort on it. I’m sure this problem ______ one day in the future.
was solved
solves
will be solved
Now my father __________ his bike to work every day instead of driving.
By the end of the last month, I _____________ all the CDs of Justin Bieber.
You _________lose your way if you walk alone in the mountains at night. A. may B need C. should D. ought to
We didn’t start our discussion __________ everybody arrived.
Take the exam carefully, _______ you won’t get full marks.