Many experts hold the view ____teacherdevelopment is _____the key to better education lies.

Many thought that after starring in the immensely popular drama，Nirvana in Fire，Hu Ge would ________ and actively seek new roles．

___with difficult situation, Marydecided to turn to her parents for help.

Could you please clean the room— _____ I have to do my homework.

Who is making so much noise in the garden?　　　　—______ the children.