______life began on the earth is one of the biggest puzzles to scientists.
| A．How | B．What | C．Where | D．That |
I don't know the meaning of the poem，because I have little________ with modern poetry.
| A．resistance |
| B．acknowledgement |
| C．acquaintance |
| D．access |
The manager________one of the hotel servants of stealing the money.
| A．scolded |
| B．complained |
| C．accused |
| D．charged |
The cause he had devoted himself to________a perfect success.
| A．proving |
| B．proved |
| C．was proved |
| D．has been proved |
The work they got down to________again yesterday because of the bad weather.
| A．stopped |
| B．stop |
| C．stopping |
| D．be stopped |
I can't meet their requirements that I________there at once.
| A．went |
| B．have gone |
| C．go |
| D．going |