1Firstly, we need to consider the cost, secondly the time it will take, and thirdly the potential benefits.
2She gave three reasons for her decision: firstly, the job was well-paid, secondly it was close to home, and thirdly it was a great opportunity for her career.
3The company has three main goals: firstly to increase profits, secondly to improve customer service, and thirdly to expand into new markets.
4When choosing a university, consider three things: firstly the courses they offer, secondly the location, and thirdly the facilities available.
5The teacher asked the students to think about three things: firstly what they wanted to achieve, secondly how they would do it, and thirdly what obstacles they might face.