The invention of the smartphone has had a considerable impact____different aspects of our lives.

• to

• on

• wwith

• in

Nick has to work hard to keep___with the other sutdents in his class.

• on

• of

• up

• out

There was a big dog in front of me, so i bakced____carefully.

• up

• off

• in

• down

Although he failed his test, he kept___studying and retook it in May.

• on

• in

• up

• at

It isn't difficult to back____and it'll give you peace of mind

• out

• in

• up

• off

Foreign language learners find___dictionaries very useful and effective.

• language

• social

• friendly

• online

Students were encouraged to enroll in this online ____

• course

• resource

• education

• material

Jane wants to take an online _____to study art,

• experiment

• course

• language

• assignment

Distance learning is convenient as we can learn from home and then take online____to pass a course.

• essays

• presentations

• homework

• tests

Companies are increasingly making use of ___media in order to market their goods.

• commune

• social

• societal

• power