The woman pulled her hat low down ____ her eyes in order not to be recognized by the angry crowds.
--I hear Iron Man III is on recently. Let’s set off for the cinema to appreciate it now. ---________ It’s about 10 p.m. I’m so tired that I must go to bed.
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.