Correct Answer: 40

Solution : Dimensions of cuboid are 20, 16 and 8 cm.
The length of the side of the cube = 4
Volume of cuboid = $l\times b\times h$
Volume of cube = $a^3$
Number of cubes = $\frac{\text{Volume of cuboid}}{\text{Volume of cube}}$
= $\frac{20\times 16\times 8}{4\times4\times4}$
= 40
Hence, the correct answer is 40.

Correct Answer: short stories

Solution : The correct option is short stories.

Galpaguchchha is a collection of sixty-one of Rabindranath Tagore's short stories. These short stories are broadly grouped under the themes of parting ways and the relationship between men and women.

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Correct Answer: She said that it was her birthday the following week.

Solution : The correct option is the third option.

Reported speech involves conveying what someone else has said.

The steps of conversion are as follows:

• Said remains as the reporting verb.
• It is changed to it was because of the shift from the present tense to the past tense.
• My (first-person pronoun) changes to her (third-person pronoun) to reflect the change in perspective.
• Next week is changed to the following week, unless the context of the reported speech changes the timing reference. 

Therefore, the converted sentence would be: "She said that it was her birthday the following week."

Correct Answer: Mammal

Solution : The correct one-word substitute is the third option.

A mammal is a type of animal characterised by giving birth to live offspring and typically having mammary glands, which allow them to nurse their young with milk. This term encompasses all female animals that fit the description provided.

The meanings of the other options are as follows:

• A vertebrate is an animal that belongs to the subphylum Vertebrata, characterised by having a backbone or spinal column composed of vertebrates.
• A parasite is an organism that lives on or inside another organism (referred to as the host) and derives nutrients, shelter, or other benefits at the expense of the host. Parasites can cause harm or discomfort to the host organism without immediately killing it.
• Fauna refers collectively to the animal life or the entire collection of animal species found in a specific region or geological period.