Hoàn hành các câu sau

Giúp mình với. Mình cần gấp ạ!
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I am watering the flowers.
The girls are taking selfies.
They are building those towers.
Joseph is giving a speech.
My sister and I are painting the gate.
He is repairing the bikes.
My professor is writing a book.
by me.
by the girls.
Sarah is providing the snacks this afternoon.
by them.
by Joseph.
by my sister and me.
by him.
by my profesor.
by Sarah.