Although the increase in the present sum used for the research is________, a great breakthrough could still be achieved by the end of this year.
After living there for one year, they have ____ there.
He didn’t make _____ clear why he was late again.
I can hardly imagine Peter ____ across the Atlantic Ocean in five days.
I wish I ____ clever enough to work out the ____ geometry problem.
If I ____ more about diamond, I ____ cheated by that man.