20．—Though it is 30 years _____ we last met, I still remember the scene _____ we got separated on a rainy day.
| A．since; where | B．before; which | C．since; when | D．before; where |
.When you finish reading the book you will have____better understanding of _______life.
| A．a , the | B．the , a | C．\ , the | D．a , \ |
—Would you please take this box along to the office for me? —_________
| A．With pleasure | B．That’s right | C．Never mind | D．Don’t mention it. |
Tom took the police to the spot ____ the accident happened．
| A．which | B．that | C．where | D．when |
You think you’re poor, but look at people in really poor countries—it’s all ____．
| A．relative | B．simple | C．similar | D．related |
．The large grassland, reaching out far away, looks extremely beautiful _______ the blue and clean sky．
| A．with | B．against | C．through | D．beyond |