Chuyển các câu sau sang câu bị động:

1.They were starting a new system

........................................................................

2.People were not returning books

......................................................................

3.I've bought a harp

..........................................

4.They are delivering it this afternoon

.............................................................................

5.People are spending more money on food

........................................................................................

6.Someone returns the stolen gun

........................................................................

7.The Prime Minister is making a speech at the moment 

..................................................................................................