124. Alizarin Electronics has begun its foreign operations ---- the opening of a new factory in Seoul this year. 전 빈칸에 around 를 골랐는데 답은 with 이에요 ㅠㅠ

137. The city council will be accepting bid proposals for the Welby Museum restoration project ---- the end of next week. 전 within 으로 했는데 답은 until 이에요 within 해도 문맥상 맞지않나요?

140. To ensure the cleanliness and continued maintenance of Lakewood Towers, all tenants are charged $150 for a monthly cleaning ----- which is included in the total cost of rent.

전 답을 payment 로했는데 정답은 fee 더군요. 둘의 차이점은 뭐죠??

꼭 좀 가르쳐주십시요.