13．Subway Line 4，__________into use in September 2009，has made traveling in Beijing easier．
| A．having been put | B．putting | C．being put | D．Put |
I’ve finally finished my paper and it _____ me an entire month.
| A．takes | B．took | C．was taken | D．had taken |
Good heavens! There you are! We _____ anxious about you, and we _____ you back throughout the night.
| A．are； expect | B．were； had expected |
| C．have been；were expecting | D．are； were expecting |
They won’t buy new clothes because they＿＿money to buy a color TV set.
| A．save | B．are saving | C．has saved | D．were saving |
— Why? Tom, your shirt is so dirty!
— Mum, I _____ my storeroom downstairs。
| A．cleaned | B．have worked | C．was cleaning | D．have been cleaning |
— I’m sorry, but I shouldn’t have been so rude to you.
— You _____ your temper but that’s OK.
| A．have lost | B．had lost | C．did lose | D．were losing |