When in trouble, many teenagers go to their friends             for advice.

—Was the label ________your luggage?— No,it wasn’t.

______ in 1955, Disneyland in California in regarded by any as the original fun park．                                

—Can those _____ at the back of the classroom hear me?—No problem.

(2013·凉山一模)Life is like riding a bicycle. ________ your balance, you must keep moving.