He tried his best to solve the problem, _____ difficult it was.
The child tiptoed quietly to the bird.___into the forest when he was about to catch it.
By no means ___ to our plan for the trip.
___for us to surf on the sea in summer!
—— The old man wouldn’t stay at home for a rest even if it rained. —— ____.He would feel sick if he stayed home for one day.
—— What sport do you like best? —— Springboard diving.____ to dive into water from high board!