Answer: C

Explanation:

Scarcely and when comes in a pair and you have to use them in different places in a sentence to make them work. So, in this sentence, replace ‘while’ with ‘when’, e.g., Tony had scarcely finished painting when he fell asleep.

Answer: B

Explanation:

‘Hardly’ is followed by ‘had’ and ‘had’ is followed by the third form of a verb. So, the correct sentence is: Hardly had Ricky reached the platform when the train started.

Answer: C

Explanation:

‘No sooner’ is always followed by ‘than’. So, replace ‘then’ with ‘than’ in the sentence, e.g., No sooner did we reach the office than it started raining.

Answer: B

Explanation:

‘as soon as’, ‘as long as’ and ‘so long as’ are not used with than or then. Furthermore, ‘as soon as’ is used to show simultaneous actions, i.e., two actions taking place at the same time. E.g., as soon as she came, the guard opened the door. So, remove ‘then’ in the second part of this sentence, e.g., as soon as the peon rings the bell, all the students assemble.

Answer: B

Explanation:

The word ‘better’ itself shows ‘more good’ and ‘much better’ can be used instead of ‘more good’. So, remove ‘more’ from the second part of the sentence.