We _____ close friends since we got to know each other in 2006, and we always keep in touch.
| A．were | B．have been | C．will be | D．had been |
_______ a small number of Australians are bitten by spiders each year, most recover without any medical treatment.
| A．While | B．Unless | C．When | D．Because |
This morning I saw an old friend of mine in the street by ______.
| A．event | B．accident | C．affair | D．matter |
Everyone should _______________ the environment.
| A．make a contribution to protect | B．make contribution to protecting |
| C．contribute in protecting | D．make contributions to protecting |
—Listen, Lily is playing the piano!
—Wow, how sweet the music ______!
| A．is heard | B．hears | C．is sounding | D．sounds |
________ tomorrow, I would take a bus to school.
| A．If it rains | B．If it was to rain |
| C．Should it rain | D．Rained it |