Had I known about this computer program, a huge amount of time and energy ________. [ ]

Yesterday he told me a story ____ in his home town.

None of us can believe _______ little children can finish ______ much work in such a short time.

Happiness and success often come to those are good at recognizing their own strengths.

A: Listen! Is it Linda singing in the next roomB: No, it __________ be her. She is still in Shanghai.