E11 GLOBAL-15-Minute Vocabulary and Grammar Test (U1-3)

It is important to stay active and do exercise (a)   to keep fit. (regular)

If we do not sleep enough, we will find it difficult (a)   . (concentrate)

Remember to cover your mouth when coughing to prevent (a)   . (infectious)

People believe that young generations are becoming more and more (a)   . (create)

Generation gaps often result from the differences in economic and (a)   conditions among generations. (society)

Developing into a smart city requires modern (a)   infrastructure like network operations and management. (technology)

One of the most essential requirements of a smart city is that it should develop (a)   .(sustain)

Some people worry about (a)   in a smart city - people lose jobs because of smart robots and smart apps. (employ)

The construction workers started pulling down the old supermarket to build a shopping mall two days ago.

• The construction workers have started pulling down the old supermarket to build a shopping mall for two days.

• The construction workers have pulled down the old supermarket to build a shopping mall for two days.

• The construction workers haven't pulled down the old supermarket to build a shopping mall for two days.

• The construction workers haven't pulled down the old supermarket to build a shopping mall two days ago.

She last dyed her hair when she was 20.

• She didn't dye her hair since she was 20.

• She has dyed her hair since she was 20.

• It's at the age of 20 that she has dyed her hair.

• The last time she dyed her hair was at the age of 20.