Parents，of course，will do everything they could to________their children from harm.
| A．defend | B．convince |
| C．overcome | D．reduce |
Curious and ________， I rushed out of my dormitory when I heard the noise of three gunshots.
| A．astonishing | B．being astonished |
| C．astonished | D．to be astonished |
There are some tall trees in our campus, some ________ more than forty meters.
| A．measure | B．measured |
| C．measuring | D．to measure |
People believe that the China Dream is not very difficult ________ so long as the whole nation works hard for it.
| A．realizing | B．to be realizing |
| C．realized | D．to realize |
These diagrams are especially helpful when we have a concrete problem ________ at hand.
| A．be solved | B．to solve |
| C．solved | D．being solved |
At last, we found ourselves at the foot of a hill with trees providing shade and ________ down to eat our picnic lunch.
| A．sitting | B．having sat |
| C．to sit | D．sat |