__________ environmental damage is done, it takes many years for the ecosystem(生态系统) to recover.
—I can’t imagine Phelps smoking marijuana (大麻). —______.
Everyone has periods in their lives ______ everything seems very hard.
.It will not be ________ we can meet again.
. He is a cutler(刀具商)--_____, a man who sells knives and sharp tools.
. He insisted that we ________ rest until we finish the work.