What is the main idea of the passage?
A. There is a new particle called calcium nitrate .
B.Factories are polluting the environment.
C. Climate models have to be updated because of the new particle calcium nitrate.
D.Calcium nitrate has chemical properties different from other dust particles.

Mark the letter A, B,C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions
Climbing down the tree, one of the eggs was broken so he decided to throw it away.
A.it                             
B.so                            
C.one                         
D.Climbing down

Choose A, B, C, or D that best completes the sentence.
She was completely ____ because she was wearing a mask and sunglasses.
A.recognize                            
B.recognition                         
C.recognizable                       
D.unrecognizable

Exercise 1. Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer for each of the questions from 1 to 5.
Throughout the world there are different ways for people to greet each other. In much of the world, a handshake is the (1)__________ form of welcoming and greeting someone. In many countries around the Mediterranean Sea a (2)___________ kiss on the cheek is the appropriate way to welcome friends and family. It can be a very (3)__________ surprise if you expect to shake hands and get a kiss or a hug instead.
At times, it is difficult to tell what sort of greeting (4)___________ is followed. People may bow, grab another’s arm or even slap the other person on the back. In some places people just smile, look at the other’s face and say nothing.
Most people in the world are tolerant of visitors and don’t mind what travellers do that seems wrong as long as the visitors are (5)__________. A big part of the delightfulness of world travel is experiencing different customs.
(4) 
A.habit                                   
B.routine                    
C.custom                    
D.tradition

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best completes each of the following exchanges.
Anne is seeing Mary off at the airport. - Anne: “Don’t fail to look after yourself, Mary!” - Marry: “_______”
A.The same to you.
B.Oh, I knew about that.
C.Thanks, I will.
D.Of course, you are an adult.

Choose the correct answer:
Who .............. up with the idea of the ball – point pen?
A.came
B.went
C.got 
D.made

Their chances of success are small
A.It’s very likely that they will succeed.
B.It’s not very likely that they will succeed.
C. They will definitely be successful.
D.They won’t have any chances of being successful.

_______(42)
A.bring
B.lead
C.cause
D.produce

His parents (A) didn't allow (B) him to go (C) out yesterday, didn’t (D) they? 
A.His parents
B.allow 
C.to go
D.didn’t

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following question.
If you _____ when you’re coming back, it should be better to buy a return ticket.
A.had know                                     
B.knew                     
C.know              
D.knowing