China's population is expected to increase to about 1.5 billion in 2040, ______it will start to decline slowly.
| A．where | B．which | C．on which | D．after which |
―When will the visa be ready, sir?
―______ everything goes well, you will get it in 14 workdays.
| A．Although | B．As far as | C．Unless | D．As long as |
―I am really struck by your spoken English. You speak so fluently. Have you been abroad?
―Yes. I ______ in London for two years.
| A．have stayed | B．stayed | C．had stayed | D．have been staying |
______ to her school from the town of Harlan, I followed a road winding around the mountain.
| A．Getting | B．Get | C．To get | D．Got |
So hard ______ that we had to wait another day.
| A．did it rain | B．it rained | C．has it rained | D．it has rained |
I walked in our garden, ______ Tom and Jim were tying a big sign onto one of the trees.
| A．which | B．when | C．where | D．that |