This is _________ orange and that is ________ ruler.
| A．a; an | B．an; a | C．an; an | D．a; a |
I had some trouble ___my homework
| A．to finish | B．finishing | C．finishes | D．finish |
The teacher told us ____the window in class
| A．not to look out of | B．to not look out of |
| C．not look out of | D．don’t look out of |
They are both very nice.I don’t know ___
| A．what to choose | B．to choose what |
| C．which one to choose | D．to choose which one |
Old people must be____ politely
| A．spoken to | B．speak to | C．poken | D．spoke |
That day I saw some parents____at the back of the classroom,___to the teacher .
| A．sitting,listened | B．sat, listened | C．sitting,listened | D．sat,listening |