-- Is it your brother playing football outside? -- It ________ be him. He is helping mother with dishes now.
— To achieve a bright future , we should ___ study hard ___ keep in good health. — I agree with you.
The color of your trousers doesn’t ____ your jacket.
The question is __________ easy; all the students can answer it.
Xi Juan is her _______ writer.
The classroom is very _______ because some students are making some _______.