Liu Xiang is believed _____ over $ 20 million in advertisements last year alone.
A．to earn B．have earned C．to have earned D．having earned
The _______ boy made the police and his family _______.
A．gone; puzzled B．missing; puzzled C．missing;puzzling D．lost; puzzling
Kathy ______ some French while she was away on a business trip in France.
A．picked up B．took up C．made up D．turned up
Scientists are convinced _____ the positive effect of laughter _____ physical and mental health.
A．of; at B．by; in C．of; on D．on; at
Take your time — it’s just_____ short distance from here to_____ restaurant.
A．不填；the B．a; the C．the; a D．不填；a
假设你是李华，下个月将要作为交换学生去英国的一所中学学习半年。虽然你学习英语已经有几年了，但学的是美式英语，所以你发了封E-mail给曾经在你校读书的英国学生John，请教英式英语和美式英语的不同，以及交谈中应该注意的事项。
要求：1.词数：120左右；2. 可适当增删细节，使行文流畅。
Dear John,
Yours sincerely,
Li Hua.
