补全对话
A：How are you，Gina？
B：Fine，thanks．And you？
A：I’m fine，too．________________？
B：I want to join the music club．
A：Oh！Can you sing？
B：Yes，________________．What about you？
A：________________．
B：Can you play ping-pong？
A：Yeah．
B：________________，too．
A：Really？Let’s play it now．
B：OK．________________．
They expected that they could solve the problem by________（they）．
________（polite），he drove the old man out of the room and shouted at him angrily．
Be careful to cross the street when we meet heavy________（traffic）．
My mother can’t sleep well，and sometimes she even stays________（wake）the whole night．
Is it possible for us human beings to leave all the animals in the________ ________（自然环境）？