I think _______ our duty to keep our environment clean and tidy.
----Do you like a cup of tea?-----No, I prefer a cup of coffee_______some milk in it.
Look at this pair of shoes, would you like to _________
Doctor Fang has devoted all her time to _______ the patients.
---Mr Wu, who will be the new monitor of our class?---well, I haven’t decided. _______Suzy _______Millie, who is more suitable?
Daniel is good at all the subjects ,but he never shows off, he is really _________