If you want to be a telephonist, you should _________ your communication skills.
A. practiced
B. practice
C. practicing
D. to practice
Đáp án: B
Giải thích: sau động từ khuyết thiếu “should” là động từ nguyên thể
Dịch Nếu muốn trở thành người trực điện thoại, bạn nên luyện tập kỹ năng giao tiếp
She had worked as a tourist guide before __________ a teaching career.
Earl was one of the first American artists ___________ landscapes.
Marie ___________ the dream of a scientific career which seemed impossible for a woman at that time.
___________ having a private tutor, he couldn’t get good marks at school.