một người đi xe đạp xuống một con dốc dài 60m hết 10s,sao đó tiếp tục chuyển động trên quãng đường nằm ngang dài 20m với tốc độ 3,6km/h rồi dừng lại.tính

a) tốc độ của xe trên quãng đường đầu

b)tốc độ của xe trên cả 2 quãng đường

1. Many Vietnamese __________________ green tea.

A. drink                            B. drinks                                      C. drinking

1. Bài tập chuyển câu chủ động sang bị động
Chuyển các câu sau sang câu bị động.

She cleans the house every day.
They will hold a meeting tomorrow.
The artist painted a beautiful picture.
Someone has stolen my phone.
The company is building a new office.
The manager will give you a bonus next month.
People speak English in many countries.
They have completed the project on time.
The teacher is explaining the lesson to the students.
Tom wrote this letter last week.
2. Bài tập viết câu bị động
Chuyển các câu sau sang câu bị động với chủ ngữ được cho sẵn:

A new road (build) in my neighborhood.
The homework (finish) by the students before the teacher arrived.
All invitations (send) by the end of the day.
The old buildings (renovate) to preserve the historical value.
The dishes (wash) by someone after the party.
1. Hoàn thành câu với used to hoặc didn't use to
My family ______ (not go) on vacation very often when I was a child.
We ______ (play) outside every afternoon after school.
He ______ (not like) studying, but now he’s a top student.
She ______ (have) long hair, but she cut it short last year.
People ______ (send) letters instead of emails.
My parents ______ (not have) a car, so they walked everywhere.
I ______ (watch) cartoons every Saturday morning.
They ______ (not live) in the city; they moved here a few years ago.
I ______ (not eat) spicy food, but now I really enjoy it.
We ______ (use) candles during power outages before we had a generator.
2. Chọn câu trả lời đúng để hoàn thành câu
He ______ (used to / didn’t use to) play soccer, but now he plays every weekend.
We ______ (used to / didn’t use to) travel a lot, but now we prefer staying home.
She ______ (used to / didn’t use to) be shy, but now she’s very outgoing.
My family ______ (used to / didn’t use to) have a pet, but now we have two dogs.
They ______ (used to / didn’t use to) know each other in high school, but they met in college.
3. Viết lại câu sử dụng used to hoặc didn’t use to
Now I love hiking, but when I was younger, I didn’t like it.

➔ I ______ hiking when I was younger.
We didn’t have smartphones before, so we couldn’t check the internet all the time.

➔ We ______ smartphones before.
My sister was very quiet, but now she talks a lot.

➔ My sister ______ very quiet.
In the past, people wrote letters, but now we use email.

➔ People ______ letters in the past.
I always ate breakfast at home, but now I eat at work.

➔ I ______ breakfast at home.