______ label to each of the trees, with detailed introduction of their features, and visitors will know more about them and how to protect them.
Mr. Li gave all the textbooks to all the pupils, except _______ who had already taken them.
_______ matters most in learning English is enough practice.
--What did you get ______ your mother ______ Mother’s Day? -- A beautiful card ______ “Thank you, Mum”.
--Who______ it be that is knocking at the door? --It ______ be Father, but I’m not sure.
Judging from his______ expression, this problem must be quite ______.