I'm sorry I forgot to write; I had so much else ________ my mind.
Those who’d like to visit the exhibition ________ (sign) your names here.
If you want to find a decent location for your own home, ________ Mr. Smith for advice.
Each year in the United States, many black teenagers _______ of school, either because they cannot keep up or they have to work to support their family.
When he suddenly ________ up the subject of genetic engineering, there was an embarrassedsilence.
