It is reported that in our country cities __________ heavy air pollution that is 30 percent above the national standard or higher should try to meet standards by 2030.
The human race has already paid a heavy price for its slow to environment threats.
Mary and I see each other ____, but not as often as we used to.
China recently tightened its waters controls near the Huangyan Island to prevent Chinese fishing boatsfrom ______in the South China Sea.
Tom was for you to come to his birthday party.
Usually John would be late for meetings. But this time, ________ to my surprise, he arrived on time.