Is Mr. Smith in the office- No, He＿＿＿＿＿＿to the library.

My mother was ill and I had to look after her at home.—-_____________.

(2014·安徽马鞍山两校第二次联考)China is developing fast.That’s________I think those of my colleagues who deal with China affairs should visit China.

_____ worries the doctor most was _______ they could find the cause of the disease.

It is the third time that she has won the race, _______has surprised us all.