You seem in low spiritsAnything wrong?—– I ______ in the important examI let my parents down

The man in a black suit _______ be our youth worker.— I’m sure it _______ be him. I saw him in thelaboratory building some minutes ago.

Vegetables are good our health, so we should eat them every day.

Is there anything I can do for you, sir? -Well, I am looking for _____ is in charge of the experiment. [ ]

At our factory there are a few machines similar to______ described in this magazine.