43．A．years    B．months    C．days    D．weeks

42．A．physics    B．medicine    C．maths    D．chemistry

41．A．disagree with    B．agree to     C．agree    D．disagree

40．A．aren’t    B．are    C．were    D．weren’t

39．A．impossible    B．possible    C．necessary    D．unnecessary

38．A．spends    B．pays    C．costs    D．uses

37．A．for    B．of    C．about    D．at

36．A．teachers    B．soldiers    C．doctors    D．workers

35．The doctor asked my father to ______ smoking to keep healthy．

A．open    B．give up    C．put up D．make up

The cost of medical care in the US i8 very high．The time and money that  37  spend on their medical education is probably one reason  38  this problem．

A visit to a doctor’s office    39    from fifteen to fifty dollars．It is almost   40   for people to pay for the medical care they need．Many people in the US think that doctors  4l  overpaid． Most doctors ,however,．    42   ．They say that they are required to study    43  for a long lime．Tuition(学费)for many    44  of medical education costs   45   money .Doctors say that it is necessary for most medical students to borrow money from  46   to pay their tuition．Because this money must be repaid to the bank．  47   doctors need to receive a lot of money for their work .  48   ，they charge(收费)people   49   prices for medical care．

Therefore．it is possible that the high cost of medical care in   50   is necessary，because high tuition is one cause of high costs．One way to  5l  costs would be to have medical schools that are free or have low tuition．

34．They preferred．_______ in bed rather then _____ horses

A．to lie．to ride  B．1ying，ride   C．to lie ,to ride D．1ying．to ride