用下边所给词的正确形式填空。

watch, eat, discuss, take, arrive

1. —When did they_____in Beijing? 

    —Two days ago.

2. —Who is _____the talk show now?  

    —My uncle.

3. Most students in our school usually_____in the dining hall.

4. They want to _____their new plan after school.

5. My grandfather often _____a walk after dinner.