---- There is a lot of smoke coming out of the teaching-building there.
---- Really? It _____ be a fire, most probably.
| A．can | B．ought to | C．have to | D．must |
28. Last month, part of Southeast Asia was struck by floods, from ____ effects the people are still suffering.
| A．that | B．whose | C．those | D．What |
27. ---Why does she always ask you for help?
---There is no one else ____, is there?
| A．who to turn to | B．she can turn to |
| C．for whom to turn | D．for her to turn |
26.He was educated at a local grammar school, ____ he went on to Cambridge.
| A．from which | B．after that | C．after which | D．from this |
25.I have many friends, ____ some are businessmen.
| A．of them | B．from which | C．who of | D．of whom |
24. Is _____he said really true?
25.
| A．that | B．what | C．why | D．Whether |