@Thỏ
`1.` A yellow cap was given for me by my mother on my last birthday .
`2.` My vacation was spoken to her yesterday.
`3.` Mathematics were taught for many years.
`4.` You were seen at the party last night.
`5.` The cake was put on the table.
`6.` Liz was taught Vietnamese.
`7.` The postcard was mailed to his friend on her birthday.
`8.` Were those flowers sent by you?
`9.` Were many gifts received?
`10.` She was met at the meeting last week.
`11.` Newspaper are bought everywhere in the city.
