1.  

GPS _______ accurate positioning within a few centimeters.

2.  

Sound _______ faster in liquids and solids than it does in air.

3.  

Don’t bother me now. I ________ to solve a difficult math problem.

4.  

The European Union institutions ______ the European Commission, the European Court of Justice, the European Central Bank and many others.

5.  

Where are the children now?
They are in the living room _______________ tv.