Question

Use must or should to fill in the blanks.

i.A timetable -------be set for withdrawing the army.
ii.
Sita isn't home yet. She --
----- be caught up in a traffic jam.
iii.
If you get a burnt smell, you
call the emergency.
iv.
You -----try to visit Kathmandu, it is a beautiful city.
V.
Danish Uncle went to school with my father, he-----be well over forty.
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Answer 1

The suitable words have been used to fill the blanks as follows:

i. A timetable should be set for withdrawing the army.

ii. Sita isn't home yet. She must be caught up in a traffic jam.

iii. If you get a burnt smell, you should call the emergency.

iv. You should try to visit Kathmandu, it is a beautiful city.

V. Danish Uncle went to school with my father, he must be well over forty.

Answer 2

i.A timetable must be set for withdrawing the army.

ii.  Sita isn't home yet. She must be caught up in a traffic jam.

iii.  If you get a burnt smell, you  must call the emergency.

iv.  You should try to visit Kathmandu, it is a beautiful city.

V.  Danish Uncle went to school with my father, he must be be well over forty.

Explanation

‘Must’ is a modal verb that is used to express something necessary and very important; to say that something is likely or logical; when we realize that something is certainly true; to express a wish; and for recommendations. For example to tell people a rule or law, we use this modal.

‘Should’ is classified as a modal verb. There are some other modal verbs such as could, may, might, must, shall, should, will, and would. These verbs are used to express possibility, permission, ability, request, offer, suggestion, wishes, etc. In Simple conjugation only bare infinitive is used with them, (modal+ v1). We use should to say what is the best thing or the right thing to do.