Coal was formed out of dead forests by chemical ______ .
Dela had made up his mind to give it up ,but on _____ second thought ,he determined to try ______ third time.
-I'm sorry I'm late again But I…. -It's 'no use_______. It's the third time that You came late this week
_______ the TV, Tom began to read newspaper.
-Did you catch the first bus? -No ,it_______ the stop by the time I got there.
______the boy has already corrected his mistake, we should not punish him any more.