—Did Alan enjoy seeing his old friends yesterday? —Yes, he did. He ________ his old friends for a long time.
19. This kind of desk can be ________ to the height you need, which makes it very popular.
18. Whenever we hear of a natural disaster, we feel sympathy ______ the people who have been affected.
17. _______ here in time, he came _______ all the way.
16. After he left college, he was employed in an international company and _______ there ever since.
15. The factory _______ large numbers of tractors to the peasants.