Explanation

"The" is used before a specific noun that is known to the listener/reader — here, it's the specific teacher who taught us Science.

It implies there is only one particular teacher being referred to, making the definite article "the" appropriate.

Explanation

"Whom we met on holiday" cannot stand alone as a complete sentence; it depends on the main clause ("Have you seen those people"), so it's a dependent clause.

It provides extra information about "those people" and begins with the relative pronoun "whom".

Explanation

Lest is used to express a negative purpose or warning, meaning to avoid the possibility of something happening.

The correct structure after lest is a verb in the subjunctive mood (without do, does, or will).

Explanation

The phrase “went on” followed by a gerund (-ing form) means to continue doing something.

So, the correct structure is: He went on explaining the benefits.

Explanation

The modal verb "should" is used to give advice or make a recommendation.

In the sentence, "He should come to the party" suggests that it would be a good idea for him to attend.

Explanation

The word Furniture is a noun.

Economical is an adjective.

Usually, an adjective is used before a noun.

Explanation

In the sentence, "obey" is the main verb because it shows the action that "him" is made to do.

It follows the causative verb "make," which takes a bare infinitive (obey) without 'to' after it.

Explanation

Explanation

"Yours faithfully" is used when you don’t know the recipient's name (e.g., "Dear Sir/Madam").

It is the most common formal salutation in British English formal letters.

Explanation

When you say so, I must take it seriously.

"Seriously" is the correct adverb form to modify the verb "take".