Ⅰ.单句语法填空
1．When asked to make some comments ________ the mine accident，the mayor of the city said much remained to be looked into before the whole thing was reported to the public.
2．All her energies are ________(focus)upon her children and she seems to have little time for anything else.
3．Practising Chinese kungfu can not only build ________ one's strength，but also develop one's character.
4．She looked at her watch and turned ________(regret)towards home.
