Mr.Smith asked the boy a question________he could go to the concert with him.
A．whether B．that
C．what D．if
When you are reading，make a note of ________ you think is of great importance.
A．which B．that
C．what D．when
I’d like to work with ________ is honest and easy to get on with.
A．who B．whoever
C．whomever D．no matter who
Water，which seems so simple and common，is ________ makes life possible.
A．what B．that
C．which D．how
I just wonder ________ that makes him so excited.
A．why it does B．what he does
C．how it is D．what it is
________ caused the accident is still a complete mystery.
A．What B．That C．How D．Where
