________ this? It's ________.

[　　]

This________is tall for his age，so it is easy to recognize him when he is among the ________of his age．

1. A.
   child，child
2. B.
   child，childrens
3. C.
   children，children
4. D.
   child，children

This book is best seller of the year．It ______ lots of people of different ages.

1. A.
   wins
2. B.
   gives
3. C.
   shows
4. D.
   attracts

This sweater is very expensive ________ it is very beautiful．

1. A.
   but
2. B.
   and
3. C.
   or
4. D.
   so

This book is so expensive that I can't afford________it．

1. A.
   buying
2. B.
   to buy
3. C.
   buy
4. D.
   to buying