Don’t worry too much about mistakes. They are _ natural part of learning.
Not having a good sense of direction, I always take a map along whenever I____ in the city.
Much attention should ______ the environment and fighting against pollution.
When I handed the form to John, he said that Smith would be the best person ______.
A new campus of that university is reported ______ in Hi-tech Zone in Chengdu now.
. --- Sarah said she wrote you a letter. --- I wonder ______ she is writing to me about.