They promised to develop a software package by the end of this year, ________ they might have.

I went to the classroom to close the door yesterday. But as soon as I was _______ to the classroom, I found it already _______.

Do you know how many soldiers came to Haiti as United Nations Peacekeeping Forces during the earthquake—It’s hard to say. At least ___________, I think.

The famous scientist grow up _____ he was born and in 1930 he came to Shanghai. [ ]

Only when possible to settle the problem.