1.I want to listen to CDs.(listen)
2.The monster wanted to cook in the kitchen.(cook)
3.Ben likes having a picnic.(have)
4.Emma doesn’t like shopping or dancing.(shop / dance)
5.Now the fridge is new.(be)
6.Yesterday,the bins were full.(be)
7.This morning,The cupboard was messy.(be)
8.Two days ago,the kitchen was messy.
Today it is tidy.(be)
9.Now the floor is dry.(be)
10.Last night,the wardrobe was dirty.
Now it is clean.(be)
11.Last night,the bathroom wasn't wet.(be not)
12.This morning,there are many flies in thekitchen.
Now there is no flies in the kitchen.(be)
13.There was a mouse in the kitchen last night.(be)
14.There were some cakes in the fridge ten minutes ago
but now there isn't any.(be / be not)
15.There was a party at the house yesterday.(be)
单数用"is（现在时）,was(过去时)",复数用"are（现在时）,were(过去时)"就行了,你可以再检查一遍.