用所给词或短语的适当形式填空：(共10小题；每小题1分，满分10分)

excite;     once or twice;      satisfy;      come out;      all the time; warn;      run;       show somebody around;     at least;      piano;

You can ride your bike to school, but remember to be careful ________________.
This magazine isn’t popular with the students though it ________________ every week.
It’s difficult________________ both the old and the young about the program at the same time.
The kids clapped and shouted ________________ when the actor appeared.
Though he is very busy, he goes to the movies to relax ________________.
The children are interested in playing the piano, so they need more ________________.
The visitors ________________ not to swim in this river for several times.
There are no students in the classroom. They ________________ on the playground.
Thank you for ________________ the museum. We’ve learned a lot.
You must do more exercise, ________________ twice a week.