Barack Obama is the US president ________ always makes really exciting speeches.
A. who B. whose C. which
She was lying in the sofa ____a book.
| A．reading | B．read | C．to read | D．to reading |
We must have the machine ____.
| A．to repair | B．repairing | C．repair | D．repaired |
He didn’t enjoy the play because he ____.
| A．was boring | B．bored | C．was bored | D．boring |
The dog ____ mad（疯的）.
| A．looks | B．is looked | C．is being looked | D．was looked |
I think _____necessary（必要的） to learn English well.
| A．its | B．it | C．that | D．that is |