How much more expensive do you think a flat in a downtown area is than ______ in a suburban area?

— Would you like to order the two robots?— Yes, one is to help me with my homework, and ______ is for my mother to do housework.

I like __________in the early morning when the air is fresh and I can take a walk around the garden. 

 Every year, millions of people visit the Palace Museum, and many of __ are foreigners.

A new survey released by Yale University finds that Americans trust scientists most when ______ comes to information on climate change.