The professor, _____ some of his assistants, _____ to attend our discussion this afternoon

－ Whatdo you think of the lion －Well,I think it’s _____ ugly animal.

_______is a pity that the weather isn’t better for our outing today.[ ]

Only through constant practice can the ability of using a foreign language be _______.

Fred is second to none in math in our class，but ______，he hardly passed the final math exam.