1-C. His dad looked at him seriously for a moment.His dad looked at him seriously for a moment.
彼の父は、真剣に彼を見ました、一瞬だよ。
2-C. I take studying seriously but am easy to get along with.I take studying seriously but am easy to get along with.
私は、真剣に勉強している、しかし、簡単です、一緒にいるのはダヨ。
3-C. Because visitors spend so much time in line, amusement parks consider the psychological effects of waiting very seriously.Because visitors spend so much time in line, amusement parks consider the psychological effects of waiting very seriously.