4. Fill in each gap in the summary of the conversation with ONE word from 1.
(Điền vào mỗi chỗ trống trong phần tóm tắt của cuộc hội thoại với MỘT từ ở bài 1.)
Phong and his father are discussing what to buy for his studies. Phong has wanted a laptop or a smartphone (1) _____a long time because they are both very useful. Laptops (2) _______completely changed our lives since their invention but smartphones have also (3) _______the way we work and study. For example, it's fun (4) _________study with educational apps on smartphones. They allow students (5) __________ (6) __________and communicate at the same time. It's really difficult for Phong to choose between the two.