—How long ________they_________? —Sorry, I don’t know. But I know that Mr. Chen is going to _______a nurse next month.
Chairman Xi Jinping had _______ friendly talk with US President Obama in ______ America last month.
It is a pity that his son was born _______ a weak heart.
-----It’s very nice of you to carry the box for me. -----__________
The colour of this book is similar to ________ of mine.
It is not wise ________ teenagers to be crazy about stars. It is more important _____ them to learn more about Chinese culture.