Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions.

Smartphone can be a great learning ____ but you need to think of how to use it effectively.

Many young people carry a pair of earbuds as they are small, light, and ____.

Velcro has gradually become a familiar ____ for shoes, jackets, and even spacesuits.

Mark the letter A, B, C, or D to indicate the correct to each of the following questions.

A correction pen is used for ____ your writing mistakes

Mobile devices such as laptops or digital cameras can be charged by ____.

Washing machine or vacuum cleaner can help you to ____ time while doing housework.

Most smartphones now ____ flash player as well as voice and video calls.

3-D printing ____ complex tools and components.

It is convenient for you to read ____ when you travel.

Did you remember ____ Mr. Green my message?

In many classrooms, teachers use chalk to write on the ____.

We can surf the ____ to search for news, watch films, or download music.

Facebook is used____ among the young.

My computer is used for ____ music and video.

It's important ____ too much about your failure.

My father uses a calculator to ____.