Fill in the correct preposition before, by, to, of 1. At the age ... 7 I could speak...

Question

Fill in the correct preposition
before, by, to, of
1. At the age ... 7 I could speak English.
2. Do you like learning things ... heart?
3. My friend always studies ... the fest.
4. You must not study ... the test last night?

Answer 1

Of, by, to, before должно быть так