— There’s somebody at the door. Who ______ it be? Is it the postman ?—No, it ______ be him. It’s just seven o’clock. It’s too early.
---Millie,is there anything else you want to know about Yangzhou paper cutting? ---Yes,I am still wondering __________ .
---What’s wrong with you, Jack? You look tired. ---I ________ to prepare for the final exam last night.
---Lucy, is maths difficult to learn in a foreign school? ---I’m not sure, but no subject can be learned well __________hard work.
--- Mum, I ______ the theatre for minutes, but I left my ticket at home. --- Don’t worry, honey, I will take it to you.
--- __________ does your car need the vehicle repair? --- Every six months.