سلام
Q4: 1- diary. 2- hug. 3- sofa. 4- distinguished.
Q5: 1-a. 2-b. 3-b. 4-c.
Q6: 1- weren't they?
2- will he ?
3- hasn't she?
4- have he ?
Q7: 1- was discovered.
2- are used.
3- is stolen.
4- were broken.
Q8: 1- Active: my mother makes pancakes every morning.
passive: The pancakes are made every morning by my mother.
2- Active: The mechanics have repaired the cars.
Passive: The cars have been repaired by the mechanics.