Find the mistake in the sentence

They asked me what did happen last night, but I was unable to tell them.

The ………… arises when Jack and his parents have considerable disagreement on his choice of university.

The US president Barack Obama ______ an official visit to Vietnam in May 2016, which is of great significance to the comprehensive bilateral partnership.

Most important, I can quickly either start or end an online relationship whenever I want.

We invited a pop star onto the chat show, but he didn’t turn up.

I now regret spending too much money on clothes.

This ring is only made of plastic so it’s quite ............. .

Were it not for the money, this job wouldn't be worthwhile.

Identify the one underlined word or phrase that must be changed for the sentence to be correct.

Every candidate under considering for a federal job must undergo a thorough medical examination.

...... behalf of the committee, I'd like to thank you for your generous donation.

You really saw a UFO, _________?

I can’t believe how cheap these shorts were. They were a real............... !

Margaret: “Could you open the window, please?” - Henry: “_______”

We all wish to create a friendly and supportive environment ________ to learning.

Finish each of the following sentences in such a way that it means the same as the sentence printed before it

They said that Paula had quit five jobs before working for us. → Paula ________.

There is a fault at our television station. Please do not ................. your television set.