.If you have really been studying English for so long, it’s about time you _____ able to write letters in English.

This missile is designed so that once _____ nothing can be done to retrieve it.

The three men tried many times to sneak across the border into the neighboring country_____ by the police each time.

Indeed, it is arguable that body shattering is the very point of football, as killing and maiming___.

Marytiptoedoverandtooktheclockawaybecauseshehatedtohearit（）whenshewastryingtogotosleep.