1.Only when he sees the painting can he decide whether the painting is worth buying.
2.—David has made great progress recently. -- So he has,and so have you.
3. Out he rushed,with a stick in his hand.
4. Present at the meeting were all scientists from Asia.
5. Not once since my son went to school have I gone travelling with him.
6. —He ought to have been warned of the danger.-- So he has,but he wouldn’t listen to me.
7. In no country other than Britain,it has been said, can one expererience four seasons in the course of a single day.
8. In the dark forests lie many lakes,some large enough to hold several Englisg towns.
9.The boy knows little English and neither do I.
10. In front of the farmhouse lay a peasant boy.
11. Young as he is, he has much experience in learning English.
12. Hardly had the thief entered the house when he was caught.
13. Not until yesterday afternoon did it stop raining.
14. No longer is he fit to be monitor of the class.
15. On the river bank stands a house where he once lived.
16. Nowhere else in the world can you find a place so beautiful as Beijing.
17. No sooner had he begun to speak than I sensed that something was wrong.
18. Seldom does he come late for the reading room.
19. Scarcely had he sat down when he heard a knock at the door.
20. Such a noise was there that I couldn't make myself heard.