-Where's Tom? --He's left a _______ saying that he has something to do.
| A．excuse | B．sentence | C．news | D．message |
The missing Malaysia Airlines Flight MH370 was officially declared an _______ and it was a difficult moment for all.
| A．issue | B．affair | C．event | D．Accident |
He _______ around the clock since June, when the first Ebola case appeared in this agricultural county.
| A．had been working | B．has been working |
| C．is working | D．was working |
India’s space agency _______ its first pictures of Mars as its satellite begins work a day after entering orbit around the Red Planet.
| A．releases | B．replaces |
| C．relieves | D．Recognizes |
Yao Ming ended his career as a basketball player and officially________.
| A．retired |
| B．confirmed |
| C．divided |
| D．covered |
—Can I help you，sir?
—Yes，I bought this radio here yesterday，but it______________.
| A．didn't work |
| B．won't work |
| C．can't work |
| D．doesn't work |