The boats take different routes, but they all____ in the same place.
A:give up
B:clear up
C:end up
D:make up
①△=□+□+□
□=____
②□+△=48
△=____
③252÷△=○
○=____
发生装置
收集装置
洗气装置
--- What about playing ______football after school?
--- I'm afraid I can't. I have to practice playing ______ piano,