B1. 

6. Little did they suspect that the musical was going to be a runaway success.

7. Little did the embassy realize that Ted was a secret agent.

8.Hardly had i begun to apologise when the door closed. 

9.In no way can the shop be held responsible for customers lost property,

10.No sooner had the couple arrived than the priest started the ceremony. 

11.Only when Tom saw his wife's face did he understand the meaning of the comment.

12.Under no circumstances can the restaurant accept animals.

13.Rarely did the artist pay any attention to his agent's advice.

B2.

1.=>So great was her grief that she almost fainted.

2=>No sooner had he returned from his walk than he got down to writing the letter.

3.=>Hardly had she begun to speak when people started interrupting her. 

4.=>Only when they told me about it later did i realize what i had missed.

5.=>Nowhere will you find a more dedicated worker than Mrs John.

6=>At no time was the outcome of the election in doubt.

7.=>Not until he got home did he remember abot the gun.

8.=>Only by training hard every day can you become a good athlete.

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13---->Rarely did the artist pay any attention to his agent's advice