7. The university has launched a research center to develop new ways of ________ bacteria which have become resistant to drug treatments.
I found Jane________at the desk,________her homework carefully.
Much to our surprise,the witness’s________of the traffic accident differed from the official version in several aspects.
China is developing fast.That’s________I think those of my colleagues who deal with China affairs should visit China.
Our bad living habits will destroy the earth.Only by changing________we live can we save the earth.
It was only when I reread his poems recently________I began to appreciate their beauty.