____ in the iron cage of the zoo, the tiger got quite angry.
| A．To trap | B．Trapping | C．To be trapped | D．Trapped |
Thanks to the immediate measures taken by the central government, the economy of China ________ soon after the global financial crisis.
| A．took up | B．rose up | C．picked up | D．put up |
The difficulty lies in ________ they will come to our help immediately.
| A．whether | B．that | C．if | D．which |
It is recently reported that quite a number of applications ________ from Apple’s official APP. Store are not safe to use.
| A．downloading | B．downloaded |
| C．having downloaded | D．to be downloaded |
Pointing to a small village at the foot of the mountain, he told us that was ________ he was born and brought up.
| A．what | B．in which | C．how | D．where |
The discovery was made in the 1950s, while the ________ of it was not recognized until half a century later.
| A．sacrifice | B．difference |
| C．significance | D．insurance |