19. This seat is closed. Please sit ( ).
20. Would you teach my son ( ) to ride a bicycle?
21. Where did you visit ( ) your holidays?
22. I went to the grocery store ( ) I needed to buy some water.
23. It ( ) cold since last week.
(C) will be
(D) has been
24. It is ( ) for Tom to speak in front of many people.
25. Everyone in the class enjoyed ( ) the movie.
(B) to watch
26. The new law was in ( ) on the first day of this month.
27. There ( ) a lot of children in the park yesterday.