The chairman was about to declare the conference open ____ the lights went all out.
It was in the lab ________was taken charge of by Johnson ________they did the experiment.
There is no doubt at all ________she will call us when she gets there.
—Does the idea of working abroad ________ you?—Yes. But I have no chance.
What we all know is that new technology is being ________to almost every industrial process.
They will start their project,________at helping the poor children to be educated in the west of China.