The roads are lined _____trees, which have been planted to hold _____the strong winds from the north.

The USA and some other countries helped the rebels in Libya ______ their promise to support democracy and fair trade.

Large earthquakes __________ the ocean can create a series of huge, destructive waves called tsunamis that flood coasts for many miles.

.A man may be known ______- he keeps.

Thanks to the economical development, workers' wages have increased ________ as far as 200% in the recent three years.