If it ________ for the heavy rain then, we would have arrived here ahead of time.
The first successful space walk in 2013 is an important historical________in Chinese history.
—Look! Someone ________ the floor.—Well, it wasn't me. I went shopping just now.
I am looking forward to the day my daughter can read this book and know my feelings for her.
It is too early in the _____ to expect many visitors to the city.
Betty’s English is _______ than _______ in the class.