Toward the end of class, the teacher dealt in detail with the question _______ on at the beginning.
| A．discussed | B．touched |
| C．referred | D．Cast |
_I like to have my photos taken_______there are mountains and rivers.
| A．there | B．in which | C．when | D．where |
_You’d better take something to read when you go to see the doctor_______ you have to wait.
| A．even if | B．in case | C．as if | D．in order that |
_A Chinese runner,Liu Xiang,rushed to the ending line _______a surprising speed.
| A．at | B．by | C．through | D．with |
_The work is easy for an expert _______it is difficult for an inexperienced person.
| A．because | B．therefore |
| C．while | D．unless |
_You must get up early in the morning, ______we’ll have to leave without you.
| A．and | B．but | C．or | D．so |