b. why don't we take the bus? / let's take the bus!
c. why don't we watch a comedy film? / let's watch a comedy film!
d. why don't we eat some cereals? / let's eat some cereals!
e. why don't we relax and drink some hot tea? / let's relax and drink some hot tea!
f. why don't we open the windows? / let's open the windows!
