One of the requirements for the experiment is that the material _____ to its burning temperature．
| A．is heated | B．will be heated | C．be heated | D．would be heated |
The research group produced two reports based on the survey, butcontained any useful suggestions.
| A． | all | B． | none | C． | either | D． | Neither |
we understand things has a lot to do with what we feel.
| A． | Where | B． | How | C． | Why | D． | When |
If I _____it with my own eyes ,I wouldn’t have believed it.
| A．didn’t see | B．weren’t seeing |
| C．wouldn’t see | D．hadn’t seen |
I truly believe ______beauty comes from within.
| A．that | B．where | C．what | D．why |
the damage is done, it will take many years for the farmland to recover.
| A． | Until | B． | Unless | C． | Once | D． | Although |