1.   People invented the wheel thousands of years ago.

            → The wheel was invented thousands of years ago.

      2.   My father waters these flowers every morning.

            → These flowers are watered by my father every morning.

      3.   People use computers all over the world.

            → Computers are used all over the world.

      4.   Are they building a statue of Chu Van An?

            → Is.a statue of Chu Van An being built ?

      5.   John invited Fiona to his birthday party last night.

            → Fiona was invited to John's birthday party last night.

      6.   They keep many ancient things in museums.

            → Many ancient things are kept in museums. 

      7.   Do four busy streets surround the Temple of Literature?

            → Is the Temple of Literature surrounded by four busy streets?

      8.   People make many famous films in Hollywood.

            → Many famous films are made in Hollywood.

      9.   Her mother is preparing the dinner in the kitchen.

            → The dinner is being prepared by her mother in the kitchen

      10. I do all my homework on my computer.

            → All my homework is done on my computer.