13. The sun suddenly _____ from behind a cloud. a. appear b. appeared c. disappear d. disappeared 14. An oil_____ burned in the darkness. a. lamb b. lamp c. lam d. lame 15. He was late, but fortunately his friends waited for him. a. luckily b. magically c.cruelly d. lately 16. I____ football very often when I was younger. a. play b. was going to c. played d. was playing 17. Many people decorate their homes ______ Christmas. a. in b. at c.on d.when