将足量SO2通入下列溶液中，能产生浑浊的有
①Ba(OH)2溶液 ②CaCl2溶液 ③H2S溶液 ④Ba(NO3)2溶液 ⑤Na2SiO3溶液
| A．③④⑤ | B．②③⑤ | C．①③④⑤ | D．②③④⑤ |
The CDs are on sale! Buy one and you get ______ completely free.
| A．other | B．others | C．one | D．ones ks |
I’m sure that your letter will get______ attention. They know you’re waiting for the reply. 
| A．continued | B．immediate | C．careful | D．general |
All the dishes in this menu, ______ otherwise stated, will serve two to three people. 
| A．as | B．if | C．though | D．unless |
The children loved their day trip, and they enjoyed the horse ride ______.
| A．most | B．more | C．less | D．little |
Progress______ so far very good and we are sure that the work will be finished on time.
| A．was | B．had been | C．has been | D．will be |