If no one ________the phone at home, ring me at work.

Do you know the girl __________ is standing __________ the tree — Yes, she is my friend, Zhang Ying.

ing, will you take part in the comingNational English Speech Contest —______, we should catch the preciousopportunity

You can keep all the files and documentsyou think it is convenient to get them

________struck me________I would have an important meeting in Shanghai the next day[ ]