–What do you think of________nature reserve you visited last weekend?-It’s great. It is ________ideal home for wildlife.
Talk to your teacher and you will get help ________ you have a problem.
We have friends to help us fight against pollution, and trees are one of ________.
Now, people regard drinking tea ________ a culture more than a habit.
Our mother earth gives us ________ we need in our daily life.
Three bridges ________ over the river five years ago.