Now most families have only one child _____ our country’s one-child policy.
The timetable(时刻表) tells us __________________________every day.
You’d better work in your hometown and then you can ________ your old father.
My younger sister is always _________ but she also likes listening to others quietly.
-- Is it your brother playing football outside? -- It ________ be him. He is helping mother with dishes now.
--Have you finished your work yet? --Yes, I have . It ____________ half an hour ago.