---It is selfless ______ the doctor to devote all the time he had ________ for the patients.--I think so, they are so great.
— What do you think of the book? — Oh, excellent. It is worth ________ a second time.
He has given me ________ help, so I can make such great progress in Physics.
— How is your English study? — Not bad. But I ________ learning English grammar.
— Are you going anywhere? — I ________ about visiting my cousin, but I have changed my mind.
If you successfully complete a difficult task ________ hard work, you’ll become confident.