---What color is it?—It’s _______ orange. It’s orange rulerA. an an B. an 不填 C. 不填,an
We are happy_______ you some ideas.
---Tomorrow is my ________ birthday. Would you like to come? ----Sure, I ______ .
Do you need help _______ your Maths homework?
The square of fourteen is _____.
The tower is about _________ .