Children_______ be told not to swim in the river.( )
can
must
may
might
Lee can play ________ piano.He can join the music club.
— ________ club do you want to ________?—The sports club.
There were some cases ______ women employees were fired when they were pregnant.
The teacher spoke of some writers and some books ________ we need to know.
Look at ______I bought yesterday.