By the time Juan gets home, his aunt _____ for Puerto Rico.
| A．will leave | B．leaves | C．will have left | D．left |
The research lacks ___evidence,and therefore,its conclusions are doubtful
| A．solid |
| B．fierce |
| C．severe |
| D．potential |
We used to see each other___,but I haven’t heard from him since last year
| A．especially |
| B．regularly |
| C．particularly |
| D．approximately |
Bicycling is good exercise;___,it does not pollute the air
| A．nevertheless |
| B．besides |
| C．otherwise |
| D．therefore |
It was from only a few supplies that she had bought in the village___the hostess cooked such a nice dinner
| A．where |
| B．that |
| C．when |
| D．which |
Is___necessary to complete the design before National Day
| A．this |
| B．that |
| C．it |
| D．he |