The school rules state that no child shall be allowed out of the school during the day, __________ accompanied by an adult.
| A．once | B．when | C．if | D．unless |
Not that I’m unwilling to lend you a hand, __________ I’m too busy for the moment.
| A．because | B．but that | C．but | D．however |
Come and sit down by the fire. Your hand ____________.
| A．feels so cold | B．is felt so cold | C．feels so coldly | D．is felt so coldly |
. In some parts of the world, tea __________ with milk and sugar.
| A．is serving | B．is served | C．serves | D．served |
.In order to prevent the fire spreading, some of the houses nearby _____before the firemen arrived.
| A．have been pulled down | B．have pulled down |
| C．had been pulled down | D．had pulled down |
I need one more stamp before my collection _____________.
| A．had completed | B．completes | C．has been completed | D．is completed |