24.---Are you ready to leave?---Almost.I’ll be ready to go just as soon as I _____ putting the clean dishes away.
It will be many years ______the doctors and medical scientists can find _____ for cancer.
We have to ______ everything question in detail ______ we take action.
It is clear that no use can be made ______radium _____we don’t know clearly the characteristics of it.
From my point of view, the theory that ______ by the scientist is not quite scientific.
The invention of steam engine greatly sped up the industrial revolution, which _____ a lot to the take-off of the world.