People have planted a great many trees in order to ____wind and sand in the desert.
| A．hold down | B．hold up | C．hold back | D．hold out |
34．______ the danger, the man jumped into the flooding river, struggling towards the drowning boy．
| A．Regardless of | B．Instead of |
| C．But for | D．Except for |
33．I like ______ in autumn when the weather is clear and bright．
| A．this | B．that | C．it | D．One |
32．In a way I can see what you mean, even though I don't ______ your point of view．
| A．agree | B．promise | C．recognize | D．Share |
31．—Can I smoke here?
—No．On no condition ______ in the museum．
| A．is smoking permitted | B．smoking is permitted |
| C．was smoking permitted | D．smoking was permitted |
30．It's a good habit to have your car brakes ______ before a long journey．
| A．to check | B．checked | C．checking | D．Check |