Hello,have you found your pen yet?Mr Green enjoys (listening) to popular music.We can't catch the bus (if) we don't hurry.My aunt has studied in Englang (since) 2000.This book gives me knowledge and (makes) me happy.I'm afraid he'll (have) to find the lost book.She (puts) down the book and (thinks) for a while.His grandpa (is) already ninety years old.