31. It’s two weeks since we _______ the work in Beijing Ren’ai Education Institute .
| A．finish | B．have finished | C．finished | D．has finished |
The robber was guilty ___________ jewelry crimes in the past.
| A．of | B．from | C．off | D．on |
No matter ______ the weather is like, you can always find surfers out _____ the waves in Hawaii.
| A．what; riding | B．how; riding |
| C．what; to ride | D．how; to ride |
He said that he had met her two years _______.
| A．before | B．ago |
| C．for 2 years | D．since 2 years ago |
She said she would return the dictionary to me ________.
| A．tomorrow | B．last day |
| C．the next day | D．next day |
The police ____ still not sure ______ the young man killed himself or was killed.
| A．is, if | B．is, whether |
| C．are , whether | D．are, that |