1. The world (change) ………………… quickly now. Things never (stay) ………………… the same. 2. When I (come) ………………… into the class this morning, some students (play) ………………… cards and the others (talk) ………………… to one another. 3. The plane from Dallas (take) ………………… off two hours late, so I (miss) ………………… my connection flight from Frankfurt to London. 4. - Do you know where they have gone? - No, they (sell) ………………… their house and (not leave) ………………… their new dress. 5. We (know) ………………… Betty since she (move) ………………… to our neighbourhood. 6. You (watch) ………………… TV when your father (come) ………………… home last night? 7. You ever (talk) ………………… to a foreigner before? Yes, I (have) ………………… a chance to talk with some during my last vacation in Nha Trang. 8. The first fish (appear) ………………… on the earth about 500 million years ago. Up to now, more than 20,000 kinds of fish (name) ………………… and (describe) ………………… by scientists. New species (discover) ………………… every year, so the total increases continually. 9. This time next year I probably (live) ………………… on the other side of the world. 10. By the lime the war was over, thousands of innocent people (kill) …………………