用下列实验装置完成对应的实验(部分仪器已省略)，能达到实验目的的是（）
| |
A |
B |
C |
D |
| 装置 |
 |
 |
 |
 |
| 实验 |
吸收NH3 |
干燥氯气 |
石油的分馏 |
制取乙酸乙酯 |
The CDs are on sale! Buy one and you get ______ completely free.
| A．other | B．others | C．one | D．ones ks |
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’m sure that your letter will get______ attention. They know you’re waiting for the reply. 
| A．continued | B．immediate | C．careful | D．general |