Rewrite the sentences with passive voice

Exercise 3. Rewrite the sentences with passive voice: 1. They have just sent their son to the USA. __________________________________________________________________________________ 2. How long have you used this laptop? __________________________________________________________________________________ 3. Did she invite you to her birthday last night? __________________________________________________________________________________ 4. How much coffee do they produce every month? __________________________________________________________________________________ 5. Who painted your house? __________________________________________________________________________________ 6. They are preparing the dinner now. __________________________________________________________________________________ 7. I can't finish this test in 30 minutes. __________________________________________________________________________________ 8. How often does she clean the floor?