We must learn and help _________  __________( 互相 ).
The shop sells (出售) many school things, _____  _____ ( 例如 )pens, pencils，rulers, erasers and so on.
She ________   _________ ( 有空 ) on Saturdays.
Mrs. Smith likes _________ some ________( 购物 ) on Sunday morning.
Li Lei _____ _____( 不得不) go to school on foot today because his bike is broken.