Thousands of foreigners were _________ to the ShanghaiWorld Expo the day it opened.

________ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately

You ______wash your hands before meals

Zhang Yining ______Wang Nan in the 2008 Olympic Games and she _____ much experience in playing table tennis.

The middleaged woman ________ the difficulties to bring up her three children. [ ]