If we had become aware of danger earlier, we _____ to stay in that temporary shelter.

______ it rain heavily tomorrow, we would have to put off the visit to the Forbidden City.

The girl was drowned unfortunately. She ____, though, because there were so many people standing on the banks at that moment.

 —What courses are you going to do next term?—I don’t know. But it’s about time ________ on something. 

He paid for a seat, when he ______ have entered free.