—What are you doing, John? Why stop?—To be on the safe side, we’d fill up the car now for we _______ run out of gas on the way.
— Did you happen to see _______ black and _______ white cat? — Are they missing? I told you to take care of them.
Many people agree that ______ knowledge of English is a must in _______ international trade today.
As is known to us all, _____ tiger is in _____ danger of becoming extinct.
This is _____ best kind of _____ pen you can get here.
How strange! These years my birthday always falls _____.