(1)There is something wrong (with) my back.
(2)Can you sing a song (in) English
(3)Please listen (to) me carefully
(4)He sits (between) Tom and Mary
水平不高不知对否
(1)There is something wrong (with) my back.
(2)Can you sing a song (in) English
(3)Please listen (to) me carefully
(4)He sits (between) Tom and Mary
水平不高不知对否