Two years later, her brother disappeared in the war, never ________ again.
In such dry weather, the flowers will have to be watered if they ____________
It is the protection for the trees___________ really matters, rather than how many trees are planted.
We can’t go on with the experiment because the computer_________.
The two sides have finally___________, though some small differences still exist.
The sunlight came in____________ the windows in the roof and lit up the whole room.