This math problem is so hard that I can't ______ .Please give me some advice.A. look out it B. work it out C. give it out
---Why is the classroom so dirty? --- Sorry, sir. It ______ yesterday. We forgot to do it.
---Would you like something to drink? ---Yes, ______ , please.
--- Look! It’s raining heavily. ______ take a raincoat with you? --- Well, I’ll take one right now.
Last year he had an opportunity ______ abroad, but he gave it up.
---Whose book is this? ---It ______ be Linda’s. It has her name on it.