If the verb is in the past simple we use did.
Ex: They went to the theatre, didn't they? She studied in New York, didn't she?
The correct sentence will be :-
We met yesterday, didn't we?

Correct Option: C

If the verb is in the past simple we use did.
Ex: They went to the theatre, didn't they? She studied in New York, didn't she?
The correct sentence will be :-
We met yesterday, didn't we?
Therefore , required answer will be option C .

As we know that ,
The correct sentence will be :-
She couldn't help but laugh does not need any improvement.

Correct Option: B

As we know that ,
The correct sentence will be :-
She couldn't help but laugh does not need any improvement.
Therefore , option B will be required answer.

As we can say that ,
Endure means :- put up with something or somebody unpleasant.
Ex: The new clerk had to endure a lot of unprofessional remarks.
The correct sentence will be :-
You must endure what you cannot cure does not need any improvement.

Correct Option: B

As we can say that ,
Endure means :- put up with something or somebody unpleasant.
Ex: The new clerk had to endure a lot of unprofessional remarks.
The correct sentence will be :-
You must endure what you cannot cure does not need any improvement.
Hence , required answer will be option B .

As we know that ,
The world is facing a crisis is a meaningful sentence.
Correct sentence will be :-
The world is facing a crisis .

Correct Option: B

As we know that ,
The world is facing a crisis is a meaningful sentence.
Correct sentence will be :-
The world is facing a crisis .
Hence , required answer will be option B .

As we know that ,
In the first conditional sentences the structure is: If + simple present simple future If this thing happens, that thing will happen. Ex: If you don't hurry, you will miss the train. If it rains today, you will get wet.

Correct Option: A

As we know that ,
In the first conditional sentences the structure is: If + simple present simple future If this thing happens, that thing will happen. Ex: If you don't hurry, you will miss the train. If it rains today, you will get wet.
The correct sentence will be :-
If I get an opportunity, I shall attend the seminar.
Thus , option A will be required answer .