He knows nothing about it, so he can’t help _______ any of your work.
. He apologized for _____.
I feel it is your husband who _______ for the spoiled child.
________to sunlight for too much time will do harm to one's skin.
--Shall we go to visit Uncle Lee this weekend? --_________. I wonder whether I will be free that day.
No one is allowed ______ in the classroom.