High school students continue to work hard, _______ they often complain about great burdens and pressures in their life.
--" Would you mind the window? It's hot here!" May said. --"__________. "Tom replied.
--Hi, Tracy, you look tired. --I am tired. I__________ the living-room all day.
--Thank you very much. --Not at all , I was____________ glad to help.
In Switzerland, six miles west of Geneva,___________ a collection of laboratory buildings.
Collecting stamps as a hobby___________ increasingly popular during the past fifty years.