— Why don’t you go into the office ,John
—I have ______ my office keys at home.
| A．forgot | B．kept | C．leaving | D．left |
The couple are at the same age, but, the husband looks much older than his wife.
| A．in addition | B．in reality | C．in contrast | D．in detail |
After so many hardships, the scientist his motherland at last.
| A．set on his foot | B．set foot on | C．set feet on | D．set his feet on |
Sarah pretended to be cheerful, nothing about the argument.
| A．says | B．said | C．to say | D．saying |
Some forms of algae have to growing on ice.
| A．adopt | B．adapt | C．advocate | D．addict |
Antarctica holds 90% of the world’s ice, and most of its fresh water (70%) is in a frozen .
| A．state | B．condition | C．situation | D．solution |