Read the given sentence and choose the correct modal auxiliaries to fill in the blanks.
______ you drop me at the bus stop.

The correct answer is: Could

Solution : option (b) Could
Could you drop me at the bus stop?
The modal auxiliary " could " is used to express possibility or past ability . It is also used to make suggestions and requests. " Could " is basically used in conditional sentences as conditional form of "can". Here, in the sentence it is used to make request.