Yesterday the traffic was _______ for hours by a terrible accident on this stretch of the motorway. [ ]

no life has been found outside the earth, but while some scientists areactively searching for living things in outer space, others firmly believethere ____

The manager ________ the workers how to improve the program since 9 am.[ ]

___ he read the book， ____ he got in it.

We must do something to stop people from______.