Dãy các chất nào sau đây toàn là oxit bazơ?

A. CuO, K₂O, NO₂

B. Na₂O, CO, ZnO

C. PbO, NO₂, P₂O₅

D. MgO, CaO, PbO

Read the following text and decide which answer best fits each numbered blank.
I'm Linh and now I (1) _____________ at a high school in the United States. My biggest
challenge in the United States is the language (2) _____________. I (3)_____________ English for
five years but I still face difficulties in communication. For all the time, I feel nervous to understand

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what other people were saying and why they were laughing. (4)_____________I go to see an American
movie, I still can't understand the actors. Maybe because spoken English has a lot of idioms
and communication (5)_____________ may happen due to cultural differences.
Leaving home and (6) _____________ to study in a new country can be a stressful experience.
However, I have learned some ways to overcome my problem. First, I usually tell people that I am
learning English in case they don't understand me. Second, I listen (7)_____________. If I don't
understand something for the first time, I'm not afraid (8) _____________ questions as many times as it
is necessary. Watching people speak also help me to add new words to my vocabulary. Finally, my big
fear is public speaking, so I decided (9) _____________down what I want to speak. This is good
because I already have some words and sentences in my mind, instead of (10) _____________ during
the presentation.
1. A. am studying B. study C. studies D. will be studying
2. A. difficulties B. world C. barrier D. communication
3. A. study B. studies C. have studied D. studied
4. A. When B. Which C. Who D. Why
5. A. barrier B. breakdown C. interaction D. distance
6. A. travelling B. travel C. to travel D. travels
7. A. careful B. carefully C. careless D. carelessly
8. A. to raise B. raises C. raise D. raising
9. A. write B. to write C. writing D. writes
10. A. think B. to think C. thinks D. thinking

Read the following text and decide which answer best fits each numbered blank.
Earth Day Network's mission is to diversify, educate and activate the environmental movement
worldwide. More (1) _____________1 billion people now participate in Earth Day activities (2)
_____________ year. This can make it the largest observance in the world. Members of this
organization (3)_____________ through a combination of education, public policy, and consumer
campaigns.
The first Earth Day (4)_____________ April 22, 1970, activated 20 million Americans from all
walks of life and is widely (5) _____________ with launching the modern environmental movement.
The passage of the landmark Clean Air Act, Clean Water Act, Endangered Species Act and
(6)_____________ other ground-breaking environmental laws soon followed. Twenty years
(7)_____________, Earth Day went global, mobilizing 200 million people in 141 countries and lifting
environmental issues onto the world stage. Now, this day is becoming (8) _____________and more
popular in over the world.
1. A. of B. than C. then D. with
2. A. much B. many C. each D. other
3. A. to work B. works C. working D. work
4. A. on B. in C. at D. until
5. A. credit B. credits C. credited D. crediting
6. A. much B. many C. little D. few
7. A. later B. latest C. late D. lately
8. A. many B. much C. most D. more