He is very grateful to the girl____ he often turns for help when he meets with difficulties.
Someone who lacks staying power and perseverance is unlikely to ______ a good researcher.
.-- His father is a professor and has been teaching in the university for more than twenty years. -- _____.
.Why? I have nothing to confess. _______ you want me to say?
.Don't have your children _____ for hours reading books in _____ dark a room.
You were stupid to climb up that big tree. You ______ yourself.