ubah ke kalimat pasif, help ya kak

i. Renewable energy hasn't been used here.
j. Wool sweaters shouldn't be wast in hot water.
k. The language lab couldn't be used yesterday because the equipment was being fixed.
l. Things you need to do must not be postponed. Important work shouldn't be done in the last minute.
m. Are experiments done by scientists?
n. Is the apartment being demolished by the workers?
o. Have the contracts been signed by the directors?
p. Can the letter be translated into German by Mr. Jones?
q. Is the baby going to be fed by them?
r. Has their house been sold?
s. How was the solution to the problem been developed?
t. Why is the fence being painted by Peter today?