1.can be finished
2.is produced
3.will be sung
4.needn't be done
5.was sent to
6.is used
7.was made to do（这道题是不是有些问题 空不对）
8.has been given
9.was built
10.will be played
11.are bought by
二,1.are,told 2.will be put 3.must be sent 4.are sold 5.is,made ,is made of
6.was given 7.can,be taken 8.is cleaned 9.can be seen 10.have been watered
11.are made 12.are grown 13.is learet