giúp mik vs ạ, mik đg cần gấp

`31.A`

`=>` Dẫn chứng `:` Video conferencing is the technology that allows you to hold meetings with people who are in different places while seeing them and talking to them in real time .

`32.C`

`=>` Dẫn chứng `:` In the past, video conferencing needed complex and expensive equipment.

`33.C`

`=>` Dẫn chứng `:` Moreover, video conferencing is also an important tool for people who work away from the office, often at home because it helps to save time and money for them. 

`34.B`

`=>` Dẫn chứng `:` Courses can take place with the teacher and each different student living in a different location.