Input: Continue writing.

I tried to use a new chemical to clean the wall but it didn't work because the
OPTIONS:
- chemical is weak.
- wall is weak.

Continued: chemical is weak.

Input: Continue writing.

The ski resort had new rules, so we had to use skis instead of snowboards as the
OPTIONS:
- skis were more dangerous.
- snowboards were more dangerous.

Continued: snowboards were more dangerous.

Input: Continue writing.

Mark is collecting coins and has recently bought a valuable ancient coin and traded inexpensive for a contemporary coin. The
OPTIONS:
- ancient coin is expensive.
- contemporary coin is expensive.

Continued: ancient coin is expensive.

Input: Continue writing.

The teeth of Erin were a lot dirtier than Betty's teeth, due to
OPTIONS:
- Erin being hygienic.
- Betty being hygienic.

Continued:
Betty being hygienic.