There are five pairs, but I'm at a loss which _____ to buy.
Many students_______from the new library since it was open to all.
The doctor ______ him to give up smoking, but he refused.
— If you listen to me, you ______ take a good rest at once. — OK, I ______ do so.
What surprised me was not what he said but ______ he said it.
— ______ will get the first prize? — I'm sure, Li Hua.