385. Turn off all the switches before leaving the workshop.
$=>$ All the switches must be turned off before you leave the workshop.
388. We had to cancel the picnic because the weather was terrible.
$=>$ The weather was so terrible that we had to cancel the picnic.
$=>$ It's was such the terrible weather that we had to cancel the picnic.
$=>$ The weather was terrible due to we had to cancel the picnic.
397. They are getting someone to mend the windows.
$=>$ They are having the window mended.
398. Although it was dark, he could tell it was her.
$=>$ Despite the dark, he could tell it was her.
425. That she failed the final exam surprised her friends.
$=>$ Her friends were surprised that she failed the final exam.
426. Her parents never let her clean the dishes after meals.
$=>$ Her parents never have the dishes cleaned by her.