At that time, he spent as much time as he can _______the ancient status which would be sank in the river.
| A．paint | B．to paint | C．painting | D．painted |
______ 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 |
_______ with care, one tin will last for six weeks.
| A．Use | B．Using | C．Used | D．To use |