下列离子方程式书写正确的是
| A．金属铝投入到氢氧化钠溶液中：2Al＋2OH-＝2AlO2-＋H2↑ |
| B．AlCl3溶液中加入足量的氨水：Al3+＋ 3OH－＝Al(OH)3↓ |
| C．三氯化铁溶液中加入铁粉 Fe3+＋Fe = 2Fe2+ |
D．二氧化碳通入碳酸钠溶液中： |
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 |
—— Do you mind my opening the window? It’s a bit hot in here.
—— ______ , as a matter of fact
| A．Go ahead | B．Yes, my pleasure |
C．Yes, I do | D．Come on |