Fill  in  the  blacks  with  correct  forms  .用所给形式填空.( 每小题1分，共10分)
（1）His feet are           ( big ) than yours .
（2）We         (see) elephants in the zoo last week .
（3）The elephant is much           (strong ) than the dog .
（4） Amy often         (buy )  a card for her teacher on Teachers’ Day  .
（5）He can          (play) the guitar.
（6）–What are you doing, Tom? –I’m          ( read ) books .
（7）I will                (play) basketball with my friends tomorrow.
（8）We         (go) swimming tomorrow.
（9）They want          (eat) apples.
（10）–How much        (be) the bananas? -32 yuan.