26. The leaves of this tree turn red ____ , so we visit it at the end of every October.
| A．in the autumn | B．in autumn | C．in early autumn | D．in late autumn |
What did he say? I don’t know what________.
| A．did he say | B．he says | C．he said | D．he is saying |
I told your friend how to get to the hotel, but perhaps I______have driven her here.
| A．could | B．should | C．must | D．might |
I’m sorry to have hurt you, but I didn’t do it________.
| A．in common | B．in fact | C．on purpose | D．as usual |
It is the first time that I_______to Beijing.
| A．was | B．have been | C．came | D．will come |
----Must I do well in all the subjects, Mum?
----Sure, baby! As an old saying goes, knowledge is _________.
| A．command | B．effort | C．power | D．energy |