I am trying to do what is best, but ______ I’ve got to consider the cost, which is of great importance.

I started off to walk, but Peter gave me a lift— Therefore, you _____ after all

What’s Mary like —______________________.

It is the prevention of disease_____ itssuccessful treatment that has led to the rapid increase of the world’spopulation

Food problem is becoming a big one in China! —I think the food ________ before goingto shops or supermarkets.