1、He is good at singing, ______ we all know.
A.that
B.as
C.whom
D.what
2、She gave us a detailed ________ of the local government’s new health-care proposal.
A.impression
B.explanation
C.education
D.communication
3、Don’t take the wrong turn before you _______ the railway station.
A.have
B.run
C.keep
D.reach
4、— When is Jay’s concert? — It’s ______ three o’clock ______ the afternoon of July 18th.
A.at; in
B.at; on
C.on; in
D.in; on
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