I.

$\text{1.}$ These arificial flowers are made of silk by my students.

$\text{→}$ be made of: đc làm từ

$\text{→}$ Thì HTD: S + is/ are/ am + PP + (by)

$\text{2.}$ Spanish is differently spoken in Spain and in Colombia.

$\text{→}$ adv đứng trước adj trong câu bị động

$\text{3.}$ Dinner isn't cooked at home (by him).

$\text{4.}$ Are clean towels provided by the hotel?

$\text{5.}$ What time is TV often watched by your kids?

$\text{6.}$ The sick man was taken to hospital by an ambulance.

$\text{→}$ Thì QKD: S + was/ were + PP + (by)

$\text{7.}$ Jessica was given a present by her friends or A present was given to Jessica by her friends.