4. People begin to know that most environmental problems exist because necessary measures for preventing them _______taken in the past.
“Would you like tea _____ coffee?” “_____, thanks.”
“_____ when does the pub stay open?” “About midnight.”
Your performance in the exam didn’t reach the required standard ---, you failed.
In the past ,the miners had to be extremely to bear the uncomfortable conditions at mines.
A block of flats are being to make room for a supermarket.