一、请在下列句子中填入适当的动词形式
1．All the preparations for the task _______________(complete)，and we're ready to start.
2．Great changed have taken place in our province because many tall buildings __________________(set) up.
3．Every possible means __________________(try) to save the wounded soldier up to now.
4．The new dictionaries are very useful. They sell well and ____________________(sell) out already.
