According to recent report, one of the rare animals, crocodile, will be in anger of dying out in 2020s
| A．a, / | B．/, the | C．the, / | D．the, the |
When he was a little boy，he ______ on the farm.
| A．used to working | B．used to work |
| C．got used to work | D．was used to work |
— Somebody has left the lab door open.
—Don't look at me.
| A．Dear me | B．Hi, there |
| C．Thank goodness | D．Come on |
_______ the two oceans the Pacific is ______ .
| A．In; the large | B．For; larger | C．Of; larger | D．Of, the larger |
—That must have been a terrifying experience.
—Yeah. I ________ in the damaged car, unable to move.
| A．was stuck | B．have been stuck |
| C．am stuck | D．had been stuck |
If you ______ the medicine you ______ better now.
| A．took ; would feel | B．had taken; fel |
| C．had taken; would feel | D．took; would have felt |