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

....... you come early to the new house, clean up my flat.

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

This imposing edifice ....... a fortune to build.

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 ...... ?