Explanation

"Did not stop" is the correct past tense form of the verb "stop".

"Covered" is the simple past form that matches the sequence of past events.

This sentence follows the structure of two completed actions in the past.

Correct sentence:

"Ali did not stop studying until he covered all the exam topics."

Explanation

Lahore is the most crowded city in Pakistan."

• "In" is used to show location within a country, city, or region.

• We say "in Pakistan" to indicate that Lahore is within the country.

So, "in" is the correct preposition here.

Explanation

Given:

• 16 machines finish the work in 4 days

• Now we want to know how many days will take 8 machines for the same work

Concept:

More machines → Less time
Fewer machines → More time
This is an inverse proportion relationship.

So,

$$text{Days} propto frac{1}{text{Machines}}$$ $$text{New Days} = 4 times frac{16}{8} = 4 times 2 = 8 text{ days}$$

Explanation

The sentence needs a past participle form of the verb "repair" after the preposition "have,"

This indicates that the electrician should have the switch repaired.

The structure "have someone past participle something" means that someone else should get something done by someone else.

Explanation

The sentence has an independent clause ("Rick prepared the food") and a dependent clause ("that they had ordered") connected by a relative pronoun ("that").

A complex sentence contains both independent and dependent clauses.

Explanation

The India-Nepal-China corridor was a concept proposed by China under its Belt and Road Initiative (BRI) to enhance regional connectivity.

It aimed to link the three countries for trade and infrastructure development, though it faced reservations from India.

Explanation

"Flora" refers to the plants and vegetation in a particular area.

"The flora in the park that bloom in the spring include rhododendrons, azaleas, and daffodils" is the correct usage in this context.

Explanation

Explanation

We are given the equation:

$$7 - m = 12 - n$$

To find$n-m$, solve the equation step-by-step:

Step 1: Rearrange the equation

$$7 - m = 12 - n Rightarrow -m + n = 12 - 7 Rightarrow -m + n = 5 Rightarrow n - m = 5$$

Explanation

To find LCM of fractions:

$$text{LCM} = frac{text{LCM of numerators}}{text{HCF of denominators}}$$HCF of denominators​

Numerators: 2, 3, 6 → LCM = 6
Denominators: 5, 10, 25 → HCF = 5

$$$$

text{LCM} = frac{6}{5}