Can you please spend _____ explaining it _____ us

It is uncertain ________ side effect the medicine will bring about, although about two thousandpatients have taken it.[ ]

Mario, I hear you bought a new car.—Yes. It _______________ in Korea and I like it very much.

Why are you so happy today —Because I to London with my parents tomorrow.

How is Helen in her new school— goes well. She is satisfied with her new school life.