It is requested that each of the teachers invited ______ a performance at the. party.
----- Can you use chopsticks, John? ----- ________ . I once stayed in China for two years.
Since the Obama administration took office, the China—US relations ________ positive development thanks to joint efforts of both sides, President Hu said at the Nuclear Security Summit in Washington, April,12,2010.
.The other day I was showing the boys the weekly chemistry experiment when, ________ I knew it, the mixture was bubbling over everywhere.
It was not until all the milu deer ________ that we realized we should build a natural park to protect them.
Do you remember a certain occasion ________ you were in trouble and at that moment I gave you a hand.