下列离子方程式中，正确的是（ ）
| A．将少量铜屑放入浓硝酸中：Cu+4H++2NO3－=Cu2++2NO2↑+2H2O |
| B．向氯化铝溶液中加入过量的氢氧化钠溶液：Al3++3OH－=Al(OH)3↓ |
| C．向氯化亚铁溶液中通入氯气：Fe2++Cl2=Fe3++2Cl－ |
| D．稀硫酸滴在铝片上：Al+3H+=Al3++H2↑ |
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 |