—I did not know you were good friends. —You__________. I have known her since she moved here. You were abroad then.
I can’t buy ________that one.
The troops _______ themselves to go into battle.
But for friction (摩擦力), people ______ neither walk, nor even stand up.
It was after he got what he had desired_____ he realized it was not so important.
He was allowed to go swimming _______ he kept near the other boys.