—Is there any vaccine(疫苗) against H1N1 flu that can be used on humans?—No, but scientists are working to develop ________ .
________ the weather, the sports meeting will be held on time.
—— Yangyang carried off the first winter Olympic ________ medal for China.—— Great! What ________ she won for our motherland.
There is no doubt ________ only by lifelong learning can we keep up with the advancing society.
Two special government projects are also ________ to protect the river.
I was going to do some shopping in Golden Eagle, but ________ watching TV at home because of tiredness.