. The research is so designed that once _______ nothing can be done to change it.
Water may __________, while time never stops.
. Jack is always occupied __________ his work, which makes him have no time to stay with his family.
Was it in the grand closing ceremony __________ people bathed themselves in a sea of abundant happiness?
26. Most people never the idea that money can buy everything.
. Mary joined the local drama club but didn’t seem to __________, so she left.