Помогите переделать предложения из активного залога в пассивный залог. Заранее спасибо!

Bicycles must not be left in the driveway
That skyscraper was built in 1934
The dinner was being cooked when I arrived
The preparations had been finished by the time the guests arrived
The streets are being repared by them this month
The new product design has been finished by them
The course will be finished by students in July
The shoes are made in that factory

People must not leave bicycles in the driveway. - Bicycles mustn't be left by people in the driveway.
They built that skyscraper in 1934. - Tha skyscraper was built (by them) in ...
They were cooking dinner when I arrived. - Dinner was being cooked by them when I arrived.
They had finished the preparations by the time the guests arrived. - The preparations had been finished (by them) by the time the guests arrived.
They are repairing the streets this month. - The streets are being repaired (by them) this month.
They have finished the new product design. - The new product design has been finished (by them).
The students will finish the course in July. - The course will be finished by the students in July.
They make shoes in that factory. - Shoes are made in that factory.