Stephen Hawking believes that the earth is unlikely to be the only planet_______ life has developed gradually.(2010 .福建)
________ will be in charge of the project______ been decided yet.
______worried the child most was _____ to visit his mother in the hospital.
We shouldn’t complain about________, because many families are much _____ in the mountainous area.
All the machines stopped _____ with the electricity _____ throughout the factory.
You should try to get a good night’s sleep ________ much work you have to do.