Rare species in the world, ______ by hundreds every year, must be jointly preserved by all countries, or humans will encounter ecological disaster in the near future.
-What’s wrong with him?
--The picture he came across____ his memory of a sad story in his childhood.
| A．set off | B．took off | C．gave off | D．put off |
You have nothing to___ by refusing to listen to our advice.
| A．catch | B．earn | C．gain | D．grasp |
–The weather is getting warmer. I hope the children won’t go onto the ice.
--I warned them_____.
| A．not to | B．not | C．won’t | D．not go |
–Are you still very busy?
-- Yes, I_____the report for the manager and it won’t take long.
| A．have just finished | B．had just finished |
| C．am just finishing | D．am just going to finish |
In the forest____, who made no contact with the outside world.
| A．living a couple | B．were a couple living |
| C．did a couple live | D．lived a couple |