1 . With a local guide ________(lead) the way, we got there easily. （所给词的适当形式填空）

2 . Tu Youyou became the first Chinese woman scientist who ________ ( lead) the project. （所给词的适当形式填空）

3 . A team of scientists ______（lead）by a professor has found out that the monarch is able to tell the time of day. (所给词的适当形式填空）