a. Sunday
b. Monday 
c. Tuesday 
d. Wednesday
e. Thursday 
f. Friday 
g. Saturday Zob is very busy. On Mondays he goes to school on Earth(地球). On Tuesdays he does his homework. On Wednesdays he plays sports. On Thursdays he helps his mum. On Fridays he helps his dad. But at the weekend there is nothing to do(无事可做). What do Billy and Lily do at the weekend? Zob wants to know. Lily says, “I often dance on Saturdays.” Billy says, “I play the piano on Sundays. “But what can I do?” says Zob. “You can collect(收集) basketball cards,” says Billy. “You can collect toys,” says Lily. But Zob doesn’t want to collect them. At last(最后), Zob has a good idea(主意). “I can collect space junk(太空垃圾)!” says Zob.
1．给短文选择一个恰当的题目，将序号写在横线上
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