Fill each gap with the most appropriate option from the list provided. 

They let him go in ....... to his age.

Fill each gap with the most appropriate option from the list provided. 

Some scientists are trying to ...... human beings in their laboratories.

Fill each gap with the most appropriate option from the list provided. 

He does not seem to know how to solve the problem ...... ?

Fill each gap with the most appropriate option from the list provided. 

These villagers ....... to grow rice.

Fill each gap with the most appropriate option from the list provided. 

Ade tried to ...... all memory of his dead father.