试题详情

______ , we stopped to look at the map.

If you look at your map, you’ll see the _____ Center at the bottom. Let’s go there to buy the ticket

---Only at night ______ to look for food in the desert.

) from the upper parts of the river valley to the lower parts, and so to the sea. But as the river

The ______ to build up space stations on the Mars is, if we cannot say it is impossible, at least v