When I called you this morning,nobody answered the phone.Where______?

_______cloning human embryos is not legal in many countries, some scientists are already pushing ahead with research in order to produce a cloned human baby

Mum, why don’t you have the robot ______ housework for you— Oh, it has caught a virus. I should have it _______ at once.

He managed to ______ his old computer ______ a new one.

Mr. Wu said he ______ us to the zoo the next week.