Infinitives for reasons; It's + adjective + to

It's a good idea ______ some basic phrases, when traveling to another country.

• learn

• learning

• to learn

______ to buy a book with some helpful expressions.

• It helpful

• Its helpful

• It's helpful

It's impossible ______ what will happen.

• guess

• guessing

• to guess

______ to learn some basics such as "hello", "good morning" and "good night".

• It easy

• Its easy

• It's easy

Sometimes, it's hard for us ______ a small travel map.

• find

• finding

• to find

It's surprising see that it is so light and clear.

• correct

• incorrect

It's hard for me understanding how it works.

• correct

• incorrect

It is exciting to see such an interesting design..

• correct

• incorrect

It amusing look right through it as you work.

• correct

• incorrect

It's hard to figuring out where the battery is.

• correct

• incorrect