Paris is________most beautiful city，where you can see_______famous Eiffel Tower．
| A．a；the | B．a；不填 | C．the；a | D．the；the |
If water becomes increasingly scarce in decades ________，water shortage will become a hot issue all over the world.
| A．coming | B．having come |
| C．to come | D．to be coming |
If there is a lot of work ________， I'm happy to just keep on until it is finished.
| A．to do | B．to be doing |
| C．done | D．doing |
To learn English well, we should find opportunities to hear English ________ as much as we can.
| A．speak | B．speaking | C．spoken | D．to speak |
A cook will be immediately fired if he was found ________ in kitchen.
| A．smoke | B．smoking | C．to smoke | D．smoked |
If you are in trouble，Mike is always willing to________a hand.
| A．lend | B．shake | C．wave | D．want |