20. melanie robins and cardinals during her hike. * a. seened b. saw c. sawed d. seen 21. while steven is finishing his math problems, becky on her science project * a. is working b. has worked c. was working d. worked 22. before we landed in ohio, we already over two of the great lakes. * a. will be flying b. had flew c. had flown d. will have flown