Can I say,<br/><br/>(a<u>) The / Lightning </u>struck in the sky.<br/><br/>(b) They<u> climbed up / climbed a flight of stairs.</u><br/> They <u>climbed up stairs.</u><br/><br/>(c) They are<u> studying for examination.</u><br/><br/>(d) He <u>was lost / He lost his way</u> in the jungle. <br/><br/>(e) Peter is <u>fixing the doorknob.</u><br/><br/>(f) He likes to <u>fly the / a kite.</u><br/><br/>(g) They are chopping a tree.