The computer system _____ suddenly while he was playing computer games.

Radium salts，which have been found to ______ in bones，give rise to bone cancer.

I don’t mind picking up your things from the store. _____, the walk will do me good.

Though she was young，she________ her most time_______ the children in remote areas.

The bill would ______ workers twelve weeks of unpaid leave for family emergencies.