$1.$ $B$

- Câu đầu tiên của đoạn văn: "About fifty students in two schools in Ha Noi, Viet Nam and Umea, Sweden have been exchanging letters in a penfriend project since $2013$".

$2.$ $D$

- tiny $=$ small (adj.): nho nhỏ.

$3.$ Telepathy and holography are the two ways of future communication mentioned in the text.

- "It's said that in a couple of decades we'll be using telepathy and holography".

$4.$ Yes, he/ she does.

- Câu cuối của bài: "Like the children in the penfriend project, I prefer to chat with my friends over a cup of tea and enjoy their company - life is more meaningful that way!"

1-D

2-B

3-Telepathy and Holography

4- Yes