19. If you are not sure _______ your strengths and weaknesses ______, you may ______ a professional expert so that you can develop yourself to the full.
He _______ to go to Tsinghua University to study after graduating from high school, so he is working very hard.
The thief went into the house at midnight, only ______ by the policemen hiding there.
. It is because English is being widely used at present _______.
Mum has always made me ________ my skin problem and encouraged me to use the cream.
After trying hard, they _______ the hope of finding an effective way to solve the problem.