—Have you finished your experiment report, Jane?—Oh, my God. I’ve _____ forgotten all about that.

--People should use public transport instead of their own private cars.--- _______.The roads are too crowded as it is.

I think the answer is right but I’m not ____ sure about it.

Attention, coffee lovers! We have for you, the best coffee machine ___ invented.

The committee is discussing the problem right now. It will_____ have been solved by the end of next week.