April Fools' Day is a day to play jokes on others, but no one knows when such a custom first ______.
----“Did you get _____ to the party?” ----- “Yes, I replied to it this morning.”
Were you given a _____, or did you have to do it?
— 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.
In the market, vegetables are sold by _______ kilogram, I mean, by _______ weight.