Why pleasant smells do not reduce pain in man is a question still _______ by scientists.
__ the help from the doctor, the little boy ____ his life.
-Which of the two poems do you like better? - ______shorter one, of course. I think it’s really _____ most interesting one.
The happy children were making _______ the coast, where they would see the sea for the first time in their lives.
Shall we _______ our discussion and have some tea or coffee?
Xi’an is ______ most beautiful tourist city and I believe I’ll come for _______ second time.