Fill in the blank with the most appropriate word-
You can _____ sing _____ dance in the competition. Only the form is allowed.
a) Neither; nor
b) Either; or
c)Both; and
d) Also; and

Hint: Read the given phrase/sentence carefully. Try to make out the meaning of it and find the subject or the predicate or the main object of the sentence.

Complete answer:
The given sentence conveys that you can sing and dance in the competition. Only the form is allowed. It is clearly shown that the listener has to choose between the two, ‘singing' and ‘dancing'.
Now let us examine all the options to find out the correct option -
Option ‘a' is Neither; nor. It cannot be the correct option because both are used when mentioning two things that are not true or possible.
Option ‘b' is Either; or. It is the correct option because both are used when there is a choice, usually of two things.
Option ‘c' is Both; and. It cannot be the correct option because both are paired with and to add emphasis to two coordinated elements in a sentence.
Option ‘d' is Also; and. It cannot be the correct option because it is used to join words, phrases, and clauses.
As we have analyzed all the given options, we can easily figure out the correct option. Here, the word to be filled in is - either, or. The complete sentence would be - You can either sing or dance in the competition. Only the form is allowed.

Note:
The compound words either work together or they don't work at all. One must know them and their correct usage.