She is not certain about __________ she has done anything wrong.
| A．if | B．whether | C．that | D．What |
Once out of the earth’s gravity, the astronaut is____by the problem of weightlessness.
| A．affected | B．effected | C．related | D．offered |
The beauty of the place ______ them to pause in their hike and rest a while.
| A．allowed | B．switched | C．invited | D．addicted |
The spacewalk performed by Chinese astronaut Zhai Zhigang on Saturday afternoon _____a major breakthrough in China's space program
| A．predicted | B．told | C．marked | D．signed |
Some fruits ______ well in warm dry climates.
| A．raise | B．grow | C．keep | D．plant |
We are at your service. Don’t _____to turn to us if you have any further problems.
| A．beg | B．hesitate | C．desire | D．seek |