A decline in electricity output forces industrial estates and cities to burn more coal and give out more carbon to _________ the shortfall.
--Why are you so anxious? --It isn’t your problem ____.
The two sportsmen congratulated each other ____ winning the match by shaking hands.
He began to take political science _________ only when he left school.
Yesterday I went to see him, _________ that he had gone abroad two days before.
– What are you reading, Tom? -- I’m not really reading, just ___ the pages.