24. Have you finished to type the letter?
A B C D
--> C. typing
25. Ms Lan has been a teacher in 14 years.
A B C D
--> C. for
26. Some people hate use smartphones at the dinner table.
A B C D
--> C. using
27. Storing data is one of the benefit of a computer.
A B C D
--> C. benefits
28. E-readers used for reading texts taken from the Internet.
A B C D
--> A. are used