Q1 - He works hard.

'Hard' is an adjective.
'Hard' is an adverb.

Q2 - She's a fast learner.

'Fast' is an adjective.
'Fast' is an adverb.

Q3 - Go straight down this road till you come to a crossing.

'Straight' is an adjective.
'Straight' is an adverb.

Q4 - That's pretty.

'Pretty' is an adjective.
'Pretty' is an adverb.

Q5 - It was pretty expensive.

'Pretty' is an adjective.
'Pretty' is an adverb.

Q6 - It's a straight road.

'Straight' is an adjective.
'Straight' is an adverb.

Q7 - She's a hard worker.

'Hard' is an adjective.
'Hard' is an adverb.

Q8 - Hold tight.

'Tight' is an adjective.
'Tight' is an adverb.

Q9 - I'm not well.

'Well' is an adjective.
'Well' is an adverb.

Q10 - She did well.

'Well' is an adjective.
'Well' is an adverb.

Q11 - My shoes are tight.

'Tight' is an adjective.
'Tight' is an adverb.

Q12 - Please don't drive so fast.

'Fast' is an adjective.
'Fast' is an adverb.