Rewrite the sentences according to the instructions in the brackets(按要求改写下列句子，每空一词）
【小题1】Jack has five lessons on Friday. （改为一般疑问句）
___________ Jack ___________five lessons on Friday?
【小题2】Mary always goes out at night. （改为否定句）
Mary _________ ___________out at night.
【小题3】We have already been to the Expo. （改为一般疑问句）
__________ you been to the Expo _____________?
【小题4】I usually go to school on foot. （改为同义句）
I usually ___________ ____________school.
【小题5】They put the rubbish into rubbish bins.（就画线部分提问）
___________ ___________they put the rubbish into?
【小题6】Let's have a walk along the lake. （改为同义句）
___________ ____________ walking along the lake?