1. A solitary viola plucks a lonely, soft F sharp. 一把中提琴独奏出孤寂婉约的升F调。
2. Choose the best choice from A to F to finish the dialogue. 从 A 到 F 中选出最好的选项完成对话。
3. In the A, B, C, D and F grading system, the first four letters are typically considered passing grades. 在 A、B、C、D 和 F 评分体系中，前四个字母通常被认为是及格。
4. On the less cute and more scary side there is Actroid F, which is so human-like that some patients may not know the difference. 外表不那么可爱且较为恐怖的是 Actroid F，它与人类相像到一些病人可能看不出区别。
5. "If we don't ask about sleep and try to improve sleep patterns in kids' struggling academically, then we aren't doing our job," F said. “如果我们不询问孩子的睡眠情况，不努力改善孩子在刻苦学习时的睡眠模式，那么我们就没有做好自己的工作。”F 说道。
