Đọc đoạn văn và chọn câu trả lời thích hợp?

The Internet has rapidly (1).......... and become part of our daily life. It's a very fast and convenient way to get information. People use the Internet (2)..........many purposes: education, communication. (3).......... and commerce. The Internet helps people communicate with friends and relatives by (4).......... of email or chatting.
However, The Internet has limitations. It is time (5).......... and costly. IT is also dangerous because of virus and bad programs. On the other hand, THe Internet (6).......... sometimes have to suffer various risks such as spam or electronic junk mail, and personal information leaking. So while enjoying surfing, be alert!
1. A. develop                B.developed                      C.development              D. developing
2. A. for                         B. in                                  C. at                              D. to
3. A. entertainment       B.entertaining                   C. entertained               D. entertain
4. A. mean                    B.meaning                        C. meant                       D. means
5. A.consume               B.consume                        C. consumer                 D.consuming
6. A. use                       B.users                             C. using                        D. used