Which of the following sentences doesn’tcontain(包含) an object clause（宾语从句）

We should start to do our homework right now. We must not _______ until tomorrow what we can do today.

Would you like to go to the cartoon show with me— It sounds like fun, ______I’m too busy.

It is said that his carelessness ____ the terrible accident.

c bottles can be recycled but they needcleaning thoroughly, _______ they