is expected to export 1 billion mobile phones this year, ________ by a surge in demand for smartphones worldwide

How does Jack usually go to school—He ride a bike,but now he is used to there.

The first textbooks _______for teaching English a foreign language came out in the 16th century[ ]

I can’t find my scissors , can you help me buy______ —Ok

________ the boy didn’t take medicine made his mother angry.