They never work hard because they haven’t known the________of study.
Are you going to be able to __________this summer?
--- Why did you buy two pairs of shoes? --- It was so hard to choose which was________, so I took them both.
She didn’t know__________she could express her ideas clearly when she was invited to speak at the meeting.
- Do you have any______? -Yes, I like chess and drama best.
- I'm sorry I made a mistake! -______. Nobody is perfect.