Was it last summer （ ） you and your friends went to Moscow?
（A）when
（B）how
（C）which
（D）that
It was on the National Day （ ） she met with her separated sister.
（A）that
（B）where
（C）when
（D）which
（ ） was Mary who picked up the wallet.
（A）He
（B）She
（C）They
（D）It
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