By the time I got to the airport, the plane ________.A. took off B. has taken off C. had taken off
The housework is ______ easy. You don't have to spend (花费) _______ time on it.
--- _______ is it from your house to the shopping mall? ---It’s twenty _______ walk.
– We will go to Beijing next week. – __________________.
It is 7 o’clock now. It’s time ________.
If you can’t ___________ English, you can ____________ it in Chinese.