To our disappointment, the research they have carried out has been limited ____ production profits, ______ making sure that GM foods are safe.

Do you like playingcomputer games –No ,I think it’s .

Tsinghua University, ______ in 1911, is home to a great number of outstanding figures.

Jim is _____ .

sn’t matter ________ you take it seriously, for_______ matters is that he can realize it.