Experts say ________ to sunlight for too much time will do harm to one’s skin.

Mr.Green stood up in defense of the 16-year-old boy, saying that he was not the one_____.

______in her most beautiful skirt, the girl tried to make herself  at the party.

 We tried ________ the window, but it was still hot in the room.

 English teachers are supposed ______their students a test in class, even after class, ______better teaching results.