The little girl was jumping __________ in the kindergarten, waiting for her mother.

. --- This kind of food is said to contain poisonous chemicals. --- So why not _____ it?

Rather than ______ on a crowded bus, he always prefers _____ a bicycle.

—Will $200 ____?      —I’m afraid not. We need at least 50 more dollars.

Bad habits are not always easy to        ; it needs your determination.