It's important for the figures __________ regularly.
| A．to be updated |
| B．to have been updated |
| C．to update |
| D．to have updated |
______ 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 |