He is leaving for Australia and it will be three years ________ he comes back.
| A．before | B．after | C．since | D．until |
Though faced with so many difficulties, they are _____ about their future.
| A．curious | B．enthusiastic |
| C．optimistic | D．concerned |
The Sahara Desert is almost _____ of the US.
| A．as big | B．the size |
| C．the area | D．the same |
---It’s a long time since I saw Marry.
--- _________ her this afternoon?
| A．Why not to | B．Why not visit her |
| C．Why not visiting | D．Why don’t visit |
—Why are you crying? Today is your birthday!
—_______. I am so excited with so many friends surrounding me.
| A．None of your business | B．Don’t mention it |
| C．Just can’t help it | D．That’s all right |
--- Haven’t seen you for ages! Where have you been ?
--- I went to Ningxia and _______ there for one year, teaching as a volunteer.
| A．stayed | B．stay |
| C．had stayed | D．am staying |