Choose the most appropriate word/phrase to complete each sentence:
1. The ____________ the temperature, the more uncomfortable it becomes in winter.
a) warmer
b) warmer
c) colder
d) lighter
2. As you climb the mountain, the air becomes ____________.
a) lighter
b) warmer
c) colder
d) darker
3. The ice cream melted under the ____________ sun.
a) hard
b) fast
c) slow
d) warm
4. The older the building, the ____________ its architecture.
a) older
b) higher
c) lower
d) darker
5. In the evening, the room seemed to get ____________ as the sun set.
a) lighter
b) darker
c) warmer
d) harder
6. The race car accelerated ____________ down the straight track.
a) fast
b) slow
c) hard
d) darker
7. The climate in the Arctic is much ____________ than in tropical regions.
a) colder
b) warmer
c) darker
d) harder
8. With age, some people become ____________ in their thinking.
a) older
b) wiser
c) richer
d) smaller
9. The river flowed ____________ as it neared the waterfall.
a) fast
b) slow
c) high
d) warm
10. The ____________ the skyscraper, the more impressive it looked against the skyline.
a) higher
b) older
c) slower
d) lighter