Choose one of the two words to complete the sentences.
Do you like (lots/much) sugar in your coffee?
He always has (plenty/a great number) to say.
He is making (many/lots of) money.
Does Barbara have (many/a great deal of) friends in New York?
Have another piece of cake – there’s (lots/a great number of) more.
Are there (much/many) more questions to answer?
There’s (lots/a good number) to eat in the kitchen.
Nick doesn’t know (a lot/much) about it.
I don’t see (lots/much) similarity between the two industries.
She gets sad when she thinks about him, which happens (a lot/lots).

Do you like much sugar in your coffee?
→ “Sugar” is uncountable, and in questions we use “much”.

He always has plenty to say.
→ “Plenty” is the natural idiomatic expression here.

He is making lots of money.
→ “Money” is uncountable, so we use “lots of”.

Does Barbara have many friends in New York?
→ “Friends” is countable, so we use “many”.

Have another piece of cake – there’s lots more.
→ “Lots more” is the correct informal expression.

Are there many more questions to answer?
→ “Questions” is countable, so we use “many”.

There’s lots to eat in the kitchen.
→ “Lots” is used with the idea of a large amount of food (uncountable/general).

I don’t see much similarity between the two industries.
→ “Similarity” is uncountable, so we use “much”.

I don’t see much similarity between the two industries.
→ Same rule as above: uncountable noun → “much”.

She gets sad when she thinks about him, which happens a lot.
→ “A lot” is the correct adverbial phrase meaning “frequently”.