1. From ancient times, the valley of the Nile has been made __________ by the river’s floods.
A. fertile B. adequate
C. wealthy D. abundant
2. From here, we can see the bridge__________construction.
A. below B. by
C. in D. under
3. From this material we can ________ hundreds of what you may call direct products.
A. derive B. discern
C. diminish D. displace
4. Generally, it is only when animals are trapped that they to violence in order to escape.
A. proceed B. appeal
C. resort D. incline
