The ability ________ an idea is as important as the idea itself.
| A．expressing | B．expressed | C．to express | D．to be expressed |
The physics teacher once said that we first _____the lightning followed by thunders because light ______ faster than sound.
| A．see; traveled | B．saw; traveled |
| C．saw; travels | D．see; travels |
Only _______ as an interpreter _______ how important it is to grasp English.
| A．when did I work; I realized |
| B．when I worked; I realized |
| C．when did I work; did I realize |
| D．when I worked; did I realize |
_______ 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 |