____ I met Nelson Mandela was a very difficult period of my life.
| A．The first time | B．The first time when |
| C．For the first time | D．That was the first time |
I haven't my photograph album _____________, but I'll show it to you later．
| A．at hand | B．at work | C．at ease | D．at length |
My headache _________ me．I thought it was going away, but it's getting worse and worse．
| A．killed | B．kills | C．is killing | D．was killing |
What I need is ___________ book that contains _____ ABC of English grammar．
| A．a; the | B．the; 不填 | C．the; an | D．a; 不填 |
—Did he come back late last night?
—No．It was not yet eight o'clock _____________ he arrived home．
| A．before | B．that | C．until | D．when |
Students are now preparing for the college entrance exam．and I hope their efforts will _____．
| A．come on | B．go up | C．stand out | D．pay off |