. As there is less and less coal and oil, scientists are exploring new ways of making use of ______ energy, such as sunlight, wind and water for power and fuel.
| A．primary | B．alternative | C．instant | D．Unique |
_______ with the size of the whole earth, the highest mountain does not seem high at all.
| A．Comparing | B．To compare | C．Compared | D．Having compared |
_______ a post office, I stopped _______ some stamps.
| A．Passed, buying | B．Passing, to buy | C．Having passed, buy | D．Pass, to buy |
We're _______ to listen to her _______ voice. It's _______ to hear her sing.
| A．pleased; pleasing; pleasure | B．pleased; pleasant; a pleasure |
| C．pleasing; pleased; a pleasure | D．pleasing; pleasant; pleasure |
.I fell down and broke three of my teeth. I wonder how many times I have to come here and get my false teeth _______.
| A．fix | B．fixing | C．fixed | D．to fix |
I still remember _______ to my home town when I was young.
| A．taking | B．taken | C．being taken | D．to take |