They studied what ______ since 2007 and found Australian electricity prices were among the highest in the developed world.
| A．has happened | B．happened | C．had happened | D．has been happening |
It is a ______ dog, 16 or 17 inches tall from the shoulder.
| A．middle size | B．middle-size |
| C．mid-sized | D．middle-sized |
He came to my class every week, but his attitude _____ that he was not really interested in the subject.
| A．expressed | B．advised |
| C．suggested | D．explained |
The writer was so ________ in his writing that he forgot to flick the ashes from his cigar.
| A．concentrated | B．devoted |
| C．absorbed | D．fixed |
The sign reads, “In case of _____ fire, break the glass and push _____ red button.”
| A．/ ; a | B．/ ; the |
| C．the ; the | D．a; a |
We _______what our soldiers have done for our country.
| A．proud of | B．are pride of |
| C．take pride in | D．take pride of |