The doorkeeper gave the alarm _______ he saw the smoke.
| A．while | B．the instant |
| C．suddenly | D．before |
John and I＿＿＿friends for eight years.We first got to know each other at a Christmas party.But we＿＿＿＿＿ each other a couple of times before that.
| A．had been； have met | B．have been； have met |
| C．had been； had met | D．have been； had met |
—— Alice came back home the day before yesterday.
—— Really ? Where ＿＿＿＿＿ ?
| A．has she been | B．had she been | C．has she gone | D．had she gone |
—— I will come to attend your lecture at 10：00 tomorrow.
—— I’m sorry, by then my lecture will have ended and I＿＿＿my guests in my office.
| A．is being met | B．will meet | C．will be meeting | D．will have met |
Do you have any idea ______ is actually going on in the classroom?
| A．that |
| B．what |
| C．as |
| D．which |
I was surprised by her words,which made me recognize ______ silly mistakes I had made.
| A．what |
| B．that |
| C．how |
| D．which |