1、I don't know _______ to do.A、what B、how C、where D、when2、She spent much time in _______ for the test.(prepare)3、What _______ when we boil water?(happen)4、A:Where is Bob?B:Everybody knows that water _______ at 0℃.(free

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1、I don't know _______ to do.
A、what B、how C、where D、when
2、She spent much time in _______ for the test.(prepare)
3、What _______ when we boil water?(happen)
4、A:Where is Bob?
B:Everybody knows that water _______ at 0℃.(freeze)

A
preparing
will happen
is frozen

1b
2preparing
3will happen