One way to ________ species under threat of extinction—whatever the cause—is to remove them to zoos or parks and feed them there.
| A．betray | B．resist | C．preserve | D．abandon |
I ___ get on the bus when I heard someone calling me from behind.’
| A．was to | B．was going to | C．would | D．was about to |
See the clouds! It ___ rain.
| A．will | B．is going to | C．must | D．certainly |
The air holds the feather back more than it ___ the stone.
| A．holds | B．do | C．has | D．does |
Do make sure that you ___ a seat today!
| A．got | B．get | C．should get | D．have got |
---Excuse me, sir, but ___ you speak English? ---Sure, but only a litte.
| A．do | B．can | C．will | D．would |