— Did you happen to see _______ black and _______ white cat?— Are they missing? I told you to take care of them.
Not until actually ____ with water shortage ____ appreciate the value of water to a region.
---Thanks a lot for your offer. I found it very helpful.---____. I’m glad you benefited from it.
--- Shall I go over to have a chat with you this evening?--- Nice of you! It is ____ great comfort to keep me ____ company, when I’m alone at home.
At the age of 29, Dave was a worker, _______ in a small apartment near Boston and ______ what to do about his future.
When he ______the door, he found his keys were nowhere.