海水是一个巨大的化学资源库，下列有关海水综合利用的说法正确的是
| A．海水中含有溴元素，只需经过物理变化就可以得到溴单质 |
| B．海水蒸发制海盐的过程中只发生了化学变化 |
| C．从海水中可以得到MgCl2，电解熔融MgCl2可制备Mg |
| D．利用潮汐发电是将化学能转化为电能 |
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 |
I can’t leave. She told me that I ______ stay here until she comes back.
| A．can | B．must | C．will | D．may |