Beijing has struggled with smog for years，which has__________ the sun and affected the health and quality of life of millions.
A．driven away B．pushed out C．broken off D．blocked off
Between the lectures is a 20 minutes’break，__________the students can get relaxed.
A．that B．which C．where D．when
The speech from the new government is a __________ that major changes are on the way．
A．notice B．feature C．signal D．mark
一How did you manage to succeed?
一It is only after we've lost everything __________we're free to do anything.
A．when B．that C．which D．what
Mum__________ me to school as she knew it was important for me to receive education，but we were so poor then．
A．had sent B．sent C．would have sent D．would send
So excited were my classmates__________ the good result of the English speech competition!
A．to know B．known C．to be known D．having known
