They are busy ________ model planes

  A. to make        B. make        C. making      D. at making

阅读下面短文，从每小题a、b、c、d中选出能填入文章中空白处的最佳答案。
    boys and girls!do you want to know what a hobby means?ok,let me tell you.
    from monday to friday most people are busy working and studying,but in the evenings and weekends they are free and    1  themselves. some watch television or go to the movies.others42  sports.this is decided by their own  3
    there are many different ways to spend our  4  time.
    almost everyone has some   5 :it may be something from colleting stamps to   6 model planes. some hobbies are very  7  ,but others don't cost anything at all. some collections are worth   8 of money, others are valuable(有价值的)only to their owners.
    i know a man who has a coin which is worth several  9 dollars. a short time ago he bought a rare(罕见的)fifty-cent piece which  10 him$250!he was very happy about this collection and thought the price was all right. on the other hand, my youngest brother collects match boxes. he has almost 600of them, but i wonder 11 they are worth any money. however,   12  my brother they are quite valuable. 13  makes him happier than to find a neo match box for his collection.
    that's what a hobby means, i think. it is something we  14 to do in our free time just for the 15 of it. the value in dollars is not important, but the pleasure it gives us is.
1．a．love     b．work    c．enjoy     d．play
2．a．look like   b．take care of    c．think about    d．take part in
3．a．lives   b．jobs     c．interests    d．things  
4．a．working      b．free    c．own    d．whole
5．a．hobbies      b．things    c．jobs      d．ways
6．a．make      b．making     c．makes     d．made
7．a．interesting    b．exciting        c．cheap     d．expensive
8．a．a little       b．a few       c．a lot    d．a number
9．a．thousand     b．thousands       c．thousands of       d．thousand of
10．a．paid     b．cost       c．took        d．spent
11．a．that      b．if       c．what       d．why
12．a．to   b．on       c．with    d．in
13．a．everything       b．anything        c．nothing       d．something
14．a．have    b．need      c．refuse    d．like
15．a．money     b．work    c．fun         d．time

From Monday to Friday most people are busy working or studying, but in the evenings and weekends they are free and  31 themselves. Some watch television or go to the cinema, others take part in sports. This is decided by their own   32  .

There are many different ways to spend our free time.

Almost everyone has some kind of   33  : it may be something from collecting stamps to ____34___ model planes. Some hobbies are very   35 , but others don’t cost anything at all. Some collections are worth(值得…的)  36 of money, others are valuable(有价值的) only to their owners.

I know a man who has a coin collection worth several   37  dollars. A short time ago he bought a rare(罕见的)fifty-cent piece which   38  him $250! He was very happy about this collection and thought the price was all right. On the other hand, my youngest brother collects match boxes. He has almost 600 of them, but I wonder(怀疑) if they are worth any money. However,  39  my brother they are quite valuable.

 40  makes him happier than to find a new match box for his collection.