非金属元素R位于第三周期，其原子的最外层有n个电子，则以下叙述错误的是
| A．R原子的电子数为10+n | B．R能形成Rn-离子 |
| C．R的最高氧化物为R2On或ROn/2 | D．R的气态氢化物的化学式是H8-nR |
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 |
Charles was alone at home, with_______ looking after him.
| A．someone | B．anyone | C．not one | D．no one |
It is often ______ that human beings are naturally equipped to speak.
| A．said | B．to say | C．saying | D．being said |