Marco Polo is said to have sailed on________Pacific Ocean on his way to Java in________thirteenth century.
| A．the；a | B．a；不填 |
| C．不填；the | D．the；the |
I tried phoning her office, but I couldn't __________.
| A．get along |
| B．get on |
| C．get to |
| D．get through |
I don't think these issues are __________ discussing with the ministers.
| A．worthy |
| B．worth |
| C．worthy of |
| D．worth to |
The rise of oil prices made scientists search for new energy re-sources to __________ oil.
| A．remove |
| B．replace |
| C．explode |
| D．explore |
The parents couldn't tolerate __________ the messy __________ in the room.
| A．seeing; scene |
| B．to see; sign |
| C．seeing; view |
| D．to see; scenery |
The speed of cars is usually limited __________30 miles per hour on the busy city street.
| A．by |
| B．at |
| C．to |
| D．for |