They will never succeed, _____ hard they try

My father will not work in his office tomorrow. He will ________ a meeting _________.

Tom wants to study at ___________ university in Europe, but hasn’t decided which one to go to yet.

Was it _____ she heard with her ears _____ really made her frightened？

We’ve made it a rule that ___________comes home first cooks supper for the whole family.