根据汉语提示完成单词。

1. The man gave a lot of money to a medical _______ (研究)．

2. He _______(栓) his horse to a tree by the road just now.

3. People get _______ (紧张) when they go to work the first time.

4. Our teacher asks me to give a _______ (演讲) next Monday.

5. We hope your children grow happily and _______(健康)．

凸透镜是许多光学仪器的重要元件，可以呈现不同的像，应用凸透镜，在照相机中成______（填“实”或“虚”）像，在投影仪中成______（填“正立”或“倒立”）的像，而直接用凸透镜做放大镜时成正立的______（填“放大”或“缩小”）的像．