Professor Zhang gave all the textbooks to all the pupils, except ________ who had already taken them.
--_____ us a definite answer can’t solve the problem.--I agree with you. Someone must have a talk with him.
He is a man of few words, and seldom speaks until _______ to.
Having a trip abroad is certainly good for the old couple, but it remains ______whether they will enjoy it.
The more you practise _____ English, the better your _____ English will be.
The flowers ________ sweet in the garden look ________ and attract the visitors to the beauty of nature.