I have been ()teapots for fifteen years

英语被动语态.
将下列句子变为被动语态,每空一词.
1.people used teapots（茶壶） to make tea.
teapots _______ _______to make tea.
2.This makes me feel thirsty.
I ______ _____ ______ feel thirsty by this.
3.Did you buy this bike from the shop
_____ ______ _____ ____ from the shop （by you）?
4.Only this year,millions of trees has been planted by the soldiers.
Only this year,The soldiers ___________ ___________ millions of trees..
5.We should speak to old men politely.
Old men ____ ____ _____ politely by us .
6.We can finish the work in two days.→
The work ______ ______ _______ in two days.
7.They produce silk in Suzhou.→
Silk _________ ________ in Suzhou.
8.The children will sing an English song.→
An English song ____ _____ ____ by the children.
9.He needs to do it now.→
It ________ __________ _________ by him now.
10.Lucy sent me a New Year Card last week.
A New Year Card ___ ____ ____ her by me last week.
11.I have given this book to the library.→
This book _____ _______ ______ to the library
12.We'll put on an English play in our school.→
An English play ___ ___ ___ on in our school.
13.More and more farmers buy colour TV set
Colour TV sets ____ ___ ____ more and more farmers.
14.My brother often mends his watch.→
His watch ______ ______ ______ by my brother.
15.You must not plant trees in very dry earth.→
Trees ___ ____ ____ ____ in very dry earth.
16.You can dig a hole in the earth.→
A Hole _________ _________ __________ in the earth.
17.He made the farmers work for a long time.→The farmers ________ _______ _______ ______ for a long time.
18Did he break the window yesterday?→
______ the window _____ _____ ______ yesterday?
19.They have sold out the light green dresses.→
The light green dresses _____ ____ _____ out.
20.We clean the classroom every day.→
The classroom _________ ________ every day.