---Has anything caught your eye in today’s newspaper? ---Yes. A new eight-kilometer-long road is under ________ that links the port area with the motorway system.
Plants _________carbon dioxide and at the same time _________oxygen. So we may put some in our bedrooms to purify the air.
President Obama told television viewers that he saw ______ as his duty to run for a second term.
The girl carrying a dictionary, come in first, ______?
---Why do you pay a visit to your parents ________? ---_______ they live in a remote village far from here.
--- When shall we restart our business? --- Not until we _____ our plan.