Excuse me, sir. I bought the shoes yesterday, but they are in different sizes. One is size 37, _____is size 38.
He works hard at English ______ he can be an English teacher in the future.
— What do you think of swimming? —It’s not easy, but I won’t ______ I want to be a good swimmer.
_____ you are, _____ mistakes you will make in the exam.
--- By the way, Robert sends his best wishes to you. --- _____.
Thank you for _____ us to your art festival.