WHO’s main activities are carrying out research on medical _______ and improving international health care. 

I will help you if you _    my secret.

We'll go swimming if we get ___________

Identify the error in each sentence: 

Political science, like the other social sciences, is not a right science.

A skilled population is the key ..............  a country's sustainable development and stability.

Identify the error in each sentence: 

The more frequently you exercise, the greatest physical endurance you will have. 

Harvey didn’t want to tell his boss the real reason why he was late, so he __________ a story about a crash having blocked up the road. 

Choose the correct answer to complete each following sentence by circling A, B, C or D. 

The building's new ventilation system circulates heat much_____________than before.

Identify the error in each sentence: (A) Some people (B) have difficulty (C) to find a job (D) to support their family

Identify the error in each sentence: If I (A) am you, I (B) would (C) follow (D) his advice.

 The …. are requiring us to repair the machines. 

Chọn đáp án đúng để hoàn thành câu:

A dry pass, meaning the ball does not _______ the water is thrown a few inches above the head of the catching player.

Chọn câu có nghĩa tương đồng nhất với câu gốc:

The accident happened because she was careless.

Hey, you play the guitar quite well. ________ to play it when you were young?

You look upset, Sven. Have you and Niger _______ again?

It is necessary that a life guard ................ the summing pool while the children are taking their swimming lessons.

Farm …. are always exported. 

The garden is … with trees and flowers. 

The students were ________ until they got the exam results.

The dog ______ its tail furiously when it saw the children.

What are the ____________ between women’s in old times and women in modern times?