I want to buy _________ piano for my daughter as the birthday gift. She's good at playing ________ piano. What do you think of _________black one?
If they ________time, they__________the new factory tomorrow.
What are the students ________?
—What’s your mother? — __________________.
A _______ schoolboy, Li Lida, first tried to cross the Qiongzhou Channel in June,2000.
He went to the factory_______ check the progress of the work.