This is the first time I have had such a delicious meal. A. I haven't had such a delicious meal before. B. This is the most delicious meal I have ever had. C. I didn't have such a deliciou (Miễn phí)

You are not allowed lớn take photos in the museum.

A. You may take photos in the museum.

B. You should take photos in the museum.

C. You mustn’t take photos in the museum.

D. You needn’t take photos in the museum.

Smoking is not allowed in public places such as: hospitals, schools.

A. You needn’t smoke in public places such as: hospitals, schools.

B. You mustn’t smoke in public places such as: hospitals, schools.

C. You don’t smoke in public places such as: hospitals, schools.

D. You may smoke in public places such as: hospitals, schools.

Olga handed in her exam paper. She then realised that she had missed one question.

A. Having realised that she had missed one question, Olga handed in her exam paper.

B. Not until Olga had handed in her exam paper did she realise that she had missed one question.

C. Had Olga realised that she had missed one question, she wouldn’t hand in her exam paper.

D. Only after Olga realised that she had missed one question did she hand in her exam paper.

The students are required lớn keep silent during the exam.

A. The students may keep silent during the exam.

B. The students must keep silent during the exam.

C. The students needn’t keep silent during the exam.

D. The students shouldn’t keep silent during the exam

It is compulsory for all the students lớn obey the class rules.

A. All the students needn’t obey the class rules.

B. All the students needn't obey the class rules.

C. All the students can't obey the class rules.

D. All the students must obey the class rules.

Perhaps he will return before you Gọi.

A. He may be returning before you called.

B. He may/might have returned before you called.

C. He should have returned before you called.

D. He may return before you Gọi.