Mr. Smith is always on time for everything. How________ it be that he was late for the flight

During his stay in the USA, Yao Ming said that he would go back to China ______ he was needed.

The suggestion he put forward was adopted with 16 votes _____ and 15 against it.

It is ______ that we can’t finish it on time.

Only when _______ according to the directions strictly will the medicine work well[ ]