-2.4 Rewrite the following sentences in the passive voice:
2.4.1
For the research we gave 50 questionnaires to-parents.
2.4.2
They should order new stock daily.
2.4.3
His principal types-faultless letters.​

The greatest gift the sumerians gave the world was the invention of writing. the sumerians were a wealthy people. they needed some way to keep track of what they owned. they began drawing pictures. they used a reed as a pen. they drew on soft pieces of clay. the soft clay was then dried in the sun. the tablet became a permanent record. later, the sumerian drawings changed into wedge-shaped symbols. this kind of writing is called cuneiform. by putting symbols together, the sumerians could write entire sentences.