Identify the error: "Some international students (i) use cassette recorders (ii) to make tapes of their classes (iii) so that they can replay the lectures (iv) again."

Find incorrect word phrase from the following sentence:
Visitors were not permitted entering the perk after the because of a lack of security and lighting.

Identify the one underlined word or phrase that would not be acceptable in standard English

At the rate the clerks were processing the application, Rahim figured that it will take four hours for his to be reviewed.

$~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(a)$ $~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(b)$ $~~~~~~~~~~~~~~~~~~~~~~~~~(c)$ $~~~~~~~(d)$

The advantages of computerized typing and editing are now being extending to all the written languages of the world.

Each sentence has four underlined words or phrases. The four underlined parts of the sentence are marked (A), (B), (C) and (D). Identify the one underlined word or phrase that must be changed in order to make the sentence correct.

$\mathrm{\underset{\text{A}}{\underline{Writers}}}$ $\mathrm{\underset{\text{B}}{\underline{like}}}$ William Shakespeare and Edgar Allan Poe $\mathrm{\underset{\text{B}}{\underline{are}}}$ not only prolific $\mathrm{\underset{\text{D}}{\underline{\text{But too interesting.}}}}$