Cambridge B1 Preliminary (PET) — All Questions

My little brother is very good ___ drawing.

• a.in
• b.at✓
• c.on
• d.for

The fixed pattern is 'good at' something. This dependent preposition must be learned with the adjective.

Whether we go out will depend ___ the weather.

• a.on✓
• b.of
• c.from
• d.to

The verb 'depend' is always followed by 'on'. 'Depend of' and 'depend from' are common errors.

I don't need any help; I really enjoy ___ in my free time.

• a.the music
• b.a music
• c.some music
• d.music✓

'Music' is an uncountable noun used in a general sense, so it takes no article (zero article). 'The music' would refer to specific music.

She has been interested ___ astronomy since she was a child.

• a.on
• b.at
• c.in✓
• d.for

The adjective 'interested' is followed by 'in'. 'Interested on/at' are not correct English.