Do you know the reason _________ pilotsturn off the plane’s lights before taking off —The practice is for the passengers toadjust to the dark _________ an emergency.

That design of a magpie on a plum tree branch __________ luck and happiness.

Tony, it’s cold outside. ________ take a jacket— OK, mom.

May I borrow these books —Certainly. You can borrow ________ of thetwo books, but you can’t borrow ________.

That is the first time that I _____ at the meet­ing