This basketball team had lots of excellent players, so its fans never expected that it ____ have failed in the final. 

 He had no choice but to go on because it is their agreement that no one ______ quit the plan half way.

Take your swimming suit because you __________ want to go swimming in the sea. 

—Look at the sign! —Oh, I see.We _______ waste water.

I ________ work out the problem at first, but after my teacher showed me an example, I ________ get the answer easily.