When I opened the door, I found my father sitting in his chair, completely _____ in the humorous stories he was reading.
| A．lost | B．absorbing | C．attracted | D．addicted |
Birds' singing is sometimes a warning to other birds ______ away.
| A．to stay | B．staying | C．stayed | D．stayed |
______ at the door before you enter my room, please.
| A．Knock | B．Knocking | C．Knocked | D．To knock |
Our friendship ______ quickly over the weeks that followed.
| A．had developed | B．was developing |
| C．would develop | D．developed |
-Have you heard about that fire in the market?
-Yes, fortunately no one ______.
| A．hurt | B．was hurt | C．has hurt | D．had been hurt |
Many people have donated that type of blood; however, the blood bank needs ______.
| A．some | B．less | C．much | D．more |