Looking up, I saw that some children _____ rags were looking at me silently as I ate. 
| A．by | B．in | C．with | D．on |
The dangerous virus ____ in the next few weeks in the laboratory can cause fatal diseases.
| A．studying | B．studied | C．to study | D．to be studied |
All the dishes in this menu, unless ____ stated, will serve two to three people.
| A．aside | B．otherwise | C．meantime | D．or |
Edward, you play so well, but I _____ you play the piano.
| A．didn’t know | B．hadn’t known | C．don’t know | D．haven’t known |
She’ll never forget her stay there ______ she found her son who had gone missing two years before.
| A．that | B．which | C．where | D．when |
Jane has been so ______ in getting used to everything that she hasn’t had time for social activities.
| A．occupied | B．confused | C．devoted | D．worried |