After driving for 20 miles,Jackson realized that he ________in the wrong direction.
It remains doubtful ______ immediate measures could be taken to prevent underground water pollution.
He was born on ______ winter morning in 2010, when ______most severe storm struck the city and caused hundreds of deaths.
---I will drive to the station to buy a ticket to Beijing for next Sunday.---______? Actually you can order a ticket online.
Having worked nonstop for three hours in the sun, John returned home, ______.
______ you may have , you should gather your courage to face the challenge .