.
Can’t we just live in today, ________ the worries of tomorrow or the regrets of the past?
| A．free from | B．aware of | C．sure of | D．tired from |
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 |
There is little doubt in your mind that he is innocent，________？
| A．is there |
| B．isn't there |
| C．is he |
| D．isn't he |