The computer system _____suddenly while Paul was searching for information on the Internet.
The government announced that six highways by the end of last year.
. As a result of destroying the forests, a large ___ _ of desert ___ covered the land.
Is this science lab ___ some foreign experts visited last Friday?
.Being examined twice a year is the rule that every driverobey in the city .
_ we left the building that I realized how dangerous the situation had been.