The …. are requiring us to repair the machines. 

If Ann _________ so fast, her car _________ into a tree. 

The police thought they would find the man they were looking for at the hotel, but he had __________ the day before. 

Yesterday, we had a discussion  ............ different cultures.

The first person to __________ the idea of nuclear fission was a Hungarian physicist named Leo Slizard. 

Most of my friends admire Milan as she can play   .............  piano so beautifully.

The …. between Vietnam and China is good. 

It is necessary for students to listen to their teacher ______. 

 I have visited ............ Portugal but I have never been to ..............  Netherlands.

The soccer match was_________ boring that most spectacular left before it ended.

Identify the error in each sentence: I found my new contact lenses strangely at first, but I got used to them in the end

Choose the best answer:
 As tourism is more developed, people worry about the damage to the flora and fauna of the island.

These quick and easy _______ can be effective in the short term, but they have a cost. 

Identify the one underlined word or phrase that must be changed in order for the sentence to be correct.

Forgetting something usually mean an inability to retrieve the material that is still stored somewhere in the memory.

He never ______ back on his word.

Although thunder and lightning are produced at the same time, light waves travel faster ............... , so we see the lightening before we hear the thunder.

Children shouldn’t be allowed ____ time ____ computer games.

This plant’s …. is high, so it attracts a lot of investment. 

Our …. have not warned our fishermen about the Changchun typhoon carefully. 

Life always needs a lot of …... 

Fort Niagara was built by the French in 1762 on land .............  the Seneca Indians.