_____ at in this way, the present economic situation doesn't seem so gloomy.
| A．Looking | B．Looked | C．Having looked | D．To look |
_______ that they may eventually reduce the amount of labor needed on construction sites by 90 percent.
| A．Such construction robots are clever |
| B．So clever the construction robots are |
| C．So clever are the construction robots |
| D．Such clever construction robots are |
Mr. White promised to help me and _______ the next day.
| A．neither he did | B．so he did |
| C．neither did he | D．so did he |
There is plenty of rain in the southeast, there is little in the northwest.
| A．because | B．therefore |
| C．while | D．as |
Don't leave the waterwhile you brush your teeth.
| A．run | B．running |
| C．being run | D．to run |
Wearrive at six. But I'm sorry we are late.
| A．should | B．were supposed to |
| C．must | D．ought to |