U10-L5. Task 4 (p.110)

a. They’re cheap or even free.

• advantage

• disadvantage

b. There must be an Internet connection.

• advantage

• disadvantage

c. You can talk to people from distant places.

• advantage

• disadvantage

d. You may receive unwanted calls.

• advantage

• disadvantage

e. You can make group calls.

• advantage

• disadvantage

f. You need a smart device.

• advantage

• disadvantage