30. This dictionary is of great use, which can help you_________many problems about words and idioms.
Whenthe future, many people will imagine a lifehigh-tech devices.
---Do you think he will do me a favor? ---As far as I know, he is the last one ___ others. He ___ be prepared to give you a hand, though.
As we all know, every minute _____ full use of ____ our lessons will do good to us students.
He had an accident ______ to work and was badly injured.
Hard work ______ success while failure often ______ laziness.