Some physics problems in this book are _________difficult for the students _________work out.

 –______is the jacket?   –It’s green.

--Is my answer to the math problem fight? ---Let me consider it carefully            I give you an answer.

-How was your school trip?-It was great,         the weather was much too hot.

 — Do you want to eat out, ________ would you rather stay at home?— It’s up to you.