33. When a student asks_________it is worth staying up doing their lessons, a teacher may find it difficult to answer.
Bears often hide themselves in places __________ can’t be found by hunters.
There were dirty marks on her trousers _______ she had wiped her hands.
After a lot of questioning, Jack ______ admitted he had taken the car.
My sister met him at the Grand Theater yesterday afternoon, so he ________ your lecture.
Though ________ in a big city, Bill always prefers to sing the songs of country life.