_______— does the history lesson start?—At nine o'clock. Let's go at once.A. What B. When C. How
I’ll never forget the lesson ______ last year.
On my visit to Australia, I feel Australians are similar ______ us in many ways.
I hope everyone can care about ______ the environment and stop ______ things.
By reading the article, we know how ______ in our daily life.
Sydney Opera House ______ a usual theatre and it symbolizes Australia.