More than two _______years ago, people knewlittle about the universe.

This is the case _____ he’s had all his money stolen. [ ]

The suggestion _____more samples be included in the experiment will be carefully considered

“Darwin teaches us that life _________ continually ________ to keeping up with a changing Earth.” The expert explained

She searched all the places where she ______ have left her necklace but it was all in vain.[ ]