After 15 years in the USA, he has finally decided to _____ American citizen-ship.
.After the earthquake, the first thing the local government did was to provide ____________for the homeless families.
It is reported that North Korea once agreed to _________its neclear program in exchange for economic aid and security guarantees.
The students are warned not to talk about anything ______ to the accident that happened the other day in the school.
The river have ________, so they will have to spend much money irrigating(灌溉) the crops.
These crops ________ well to the warm and damp climate here.