—Tom, your foreign teacher speaks Chinese fluently!—Oh, she has lived in China for six years, otherwise she _______ such good Chinese.
All animals in nature must learn to to a changing environment in order to survive.
Paul was not allowed to work he was fully recovered from the flu.
Assistance dogs are trained to help disabled to live more independent life.
— Leo, I finally persuaded my mother. — So we can go to the basketball club tonight.
Had he studied harder, he______the final exams.