Fill in the blank with the correct modal.
Students ________ not use mobile phones in the examination hall. It is strictly against the rules.
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → must
Complete sentence: Students must not use mobile phones in the examination hall. It is strictly against the rules. The second sentence says it is “strictly against the rules”.
| Option | Meaning and use | Example |
|---|---|---|
| (1) would | “Would not” shows that someone was not willing to do something. It does not state a rule. | The child would not eat his vegetables. |
| (2) need | “Need not” means something is not necessary. It does not forbid anything, but the rules forbid phones here. | You need not come early, the shop opens at ten. |
| (3) must (answer) | “must not”: something is not allowed | You must not cross the road when the light is red. |
| (4) could | “Could not” shows that someone was not able to do something in the past. The sentence is about a rule, not about ability. | Meera could not lift the heavy box. |