31.－What are on show in the museum?
－Some pictures ____ by middle-school students.
| A．taking | B．having been taken | C．taken | D．being taken |
—If he , he that food.
—Luckily he was sent to the hospital immediately.
| A．was warned, would not take | B．had been ,warned, would not have taken |
| C．would be warned, had not taken | D．would have been warned, had not taken |
Believe it or not, weather forecasts seven days in advance are, , wrong half the time, according to a US survey.
| A．at first | B．in brief | C．on average | D．by chance |
So difficult it to live in an English-speaking country that I determined to learn English well.
| A．I have felt | B．have I felt | C．I did feel | D．did I feel |
Whatever the cause of the heat may be, we do know that the earth gets hotter down we dig.
| A．further | B．the farther | C．the farthest | D．the furthest |
It’s all , isn’t? someone who is poor in this country might be considered well off in another.
| A．relative | B．related | C．relation | D．relationship |