Traditionally, college students hold a graduation ceremony to encourage themselves before they _______ on their life journey.
| A．give up | B．set off | C．get through | D．settle down |
____all the inventions have in common is ____they have succeeded.
| A．What; what | B．That; that | C．what; that | D．That ; what |
____you don’t like him is none of my business.
| A．What | B．That | C．Who | D．How |
____he will go to work in a mountain village surprises all of us.
| A．What | B．That | C．Whether | D．If |
_____more countries can use natural energy in the future remains to be seen.
| A．Whether | B．This | C．who | D．If |
It worried her a bit _____her hair was turning gray.
| A．while | B．if | C．that | D．for |