.—Would you like to join me for a quick lunch before class? —______,but I promised Nancy to go out with her.
It rained heavily,____ the basketball match had to be put off.
Does John know any other foreign language ___French?
You must work hard,____ you will not learn English well.
____production up by 60%, the company has had another excellent year.
The book is not easy.____ it's rather difficult.