2.How did he go there ? 3. What did he visit ? 4. Was he tired after the trip ? Đọc 3. đoạn văn và điền chỗ từ trống một .education, communication, entertainment and commerce. vào mỗi thích hợp nhất People use the Internet for many (1) However, the Internet has (2) ...... It is not only time- consuming and costly but also dangerous (3).... of viruses and bad programs. Moreover, Internet users sometimes have to suffer various risks such as spam or electronic junk mail, and personal (4) ... leaking. So, while enjoying surfing, be (5).....! Ai giải giúp tui với điii