If we can _____ our present difficulties, then everything should be all right.
He practises speaking English ________ cafter work and he is sure to succeed ________ .
What disappointed us was that the player should ________ the game.
The two sportsmen congratulated each other ________ winning the match by shaking hands.
The experiment shows that proper amounts of exercise, if ________ regularly, can improve our health.
________ from the top of the tower, the south foot of the mountain is a sea of trees.