密集症莲蓬乳图片:Fill in the blanks"for"or"since"

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1.Mother has done the homework____half an hour.
2.Mr.Smith has taught here____ ten years ago.
3.-How long have you stayed in Shanghai?
-____ more than two weeks.
4.The man has worked in the office____ 8 o'clock this morning.
5.The Browns have lived here____ they came to this city.

1.for
2.since
3.For
4.since
5.since

FOR
SINSE
FOR
SINSE
SINSE

for
since
for
since
since