15-Minute Vocabulary and Grammar Test

It is important to stay active and do exercise ________ to keep fit.

If we do not sleep enough, we will find it difficult ________.

Remember to cover your mouth when coughing to prevent ________.

People believe that young generations are becoming more and more ________.

Generation gaps often result from the differences in economic and ________ conditions among generations.

Developing into a smart city requires modern ________ infrastructure like network operations and management.

One of the most essential requirements of a smart city is that it should develop ________.

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

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.