Not until Tom got off the bus _______ his mobilephone missing

Do you know the tower _____ in the heart of thecity— You mean the one _____ from the Ming Dynasty

There is usually ________ in summer in Yangzhou, it helps crops(庄稼) grow well.

Can you _____ what he says?

The Mekong River Commission has found no evidence ______ the dams on the upper reaches have an influence on the water flow downstream