To keep the air clean, this hospital _____ all the patients ____ in and around it.
| A．allows; smoking | B．forbids; to smoke |
| C．prevents; smoke | D．prohibits; smoke |
----Is she missing? I told you to take care of her.
| A．the; the | B．the; / | C．a; / | D．a; the |
--- Playing table tennis.
| A．killing time | B．to kill time |
| C．spending the time | D．to spend the time |
--- Yes. It is in the reading material ____ we ____ reading yesterday.
| A．that; did | B．that; were | C．when; were | D．when; did |
| A．is improving; taking | B．has been improved; being taken |
| C．improved; taken | D．is improving; have taken |
| A．it | B．one | C．this | D．that |