Find the one mistake (A, B, C or D) in these sentences and then correct them

His mother (A) used to make (B) much him (C) when he went home (D) for holidays.

My mother thought she might run out of cash, so she took her cheque-book with her. (case)

→ My mother took her cheque-book with her ______________ out of cash.

We've been having (A) a little (B) problems (C) with the (D) new computer.

My bicycle needs to be repaired soon. (must)

→ I really ________________________________________ repaired soon.

I drink some cups of tea, have a quick breakfast and then lead the buffalo to the field.

She's decided to go _______ business as a freelance computer programmer.

You couldn’t have been successful without her help. (she)

→ You couldn’t ____________________________________________ her.

I continue to work from a quarter past eight till 10.30.