5. A. had

6. D. especially

H2.right

8. B. modernized

9. D. was taken

H2.right

1. has already watched

2. Has he written

3. have travelled

4. haven’t given

5. hasn’t seen

H2.right

Tham khảo :

Entering the first grade, my father bought me a beautiful wooden desk with the message: "There is a new desk, try to study hard!". Attached to the table is a two-story bookshelf located directly above, pressed against the wall, and a very soft padded chair. They are all painted blue, my favorite color. Flat, rectangular table top. On it I put a school lamp, an alarm clock and a very beautiful piggy bank. Second grade textbooks, notebooks and comics are placed in separate compartments on the bookshelf. Every night after I finished studying, I put up the chairs and rearranged the desk to be neat. Last year, I won the title of excellent student. The certificate of merit was hung neatly by my father in the corner of the study as a reminder to me to try harder.

William James Sidis 

Lúc 8h 1 người đi xe máy điện từ A đến B .

Lúc 9h 1 ô tô đi từ B đến A . Xác đinh thời điểm và vị trí hai xe gặp nhau .Biết rằng , xe đi từ A có tốc độ 20km/h xe đi từ B .Có tốc độ 40km/h và quãng đường AB có độ dài 80km