When asked about his result of the driving test, David said with a big smile that he had .
Mary often helps her best friend, ______ math is very poor.
Beijing is _____ capital of _____ China.
To be able to catch up with the other students, he needs ___ hard work; he needs your encouragement, too.
___ you have finished your homework, you can go and play with your friends.
She knows so much about England. She ___ there before.