--Who has broken the window in my room? --Who else _________ it but your naughty son!
The child tiptoed quietly to the bird. ______ into the forest when he was about to catch it.
He _______ busy yesterday, or he _______ you with your experiment.
A teacher of English and class teacher _______ us something about volunteer workers.
It every day so far this month. I can't tell you if it tomorrow.
A student of Fudan University ___ Huang Yang, was reported ____ by his roommate, ______ the whole nation.