My visit to your school is really an unforgettable experience, ________ I will treasure for ever.
| A．that | B．one | C．it | D．what |
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 |
She has a lot of things, so she knows exactly how to deal with such a person.
| A．gone through | B．gone on | C．gone by | D．gone into |
Parts of the cave have been badly affected by rain andto the air.
| A．express | B．excavate | C．exposure | D．expand |