Students mustn’t smoke. This sentence has the same meaning with _________________

Which of the following sentences uses grammatically incorrect form of to infinitive?

Which of the following sentences is grammatically incorrect?

Although her parents refused, Nina still wanted __________ a surgeon when she grew up.

Mrs. Weaver is a single parent. She has to work hard ____________ a living for herself and her family of five children.

He had reminded me ___________ his dictionary, but I still forgot it.