A：Good morning，sir．（81）
B：I am leaving America soon．I want to buy an American toy for my son，hut I don't know which one is the best for him．
A：（82）
B：Of course．He likes playing with electric toys．
A：（83）
B：Four years old．
A：This is a"Tiger Trucker"．I think your son will like it．
B：（84）
A：It's very simple．Put two batteries into this box，then turn on the switch，and the tiger will drive the truck．
B：So fun!（85） Here's the money．Thank you for your suggestion．
A：You are welcome．I wish you a pleasant journey．
A．I'll take one．
B．How about this one？
C．How old is your son？
D．What can I do for you？
E．Show me how it works，please．
F．Could you tell me what his hobby is？
My neighbour is a famous （sing） and she often does charity work．
More than thirty groups of are working to develop a vaccine for COVID﹣19．（scientist）
Andrew was crazy about DIY， but he always made his room dirty and ． （tidy）
To our surprise， an 8﹣year﹣old girl became the of the dancing competition． （win）
On Teachers' Day， students usually make cards to thank teachers． （they）