----Let’s ________some dumplings right now.
---- OK. I will cut up the meat first.
| A.eat | B.buy | C.heat | D.make | 
We_______onitforseveralhoursbutwehavenotyetreachedanyconclusion.
| A.work | B.areworking | C.havebeenworking | D.havebeenworked | 
I ____ to go for a walk, but someone called and I couldn’t get away.
| A.was planning | B.planned | C.had planned | D.would plan | 
Salley________Beijing for Shanghai and________there ever since. You can go and pay her a 
  visit on your way to Hangzhou.
| A.has left; worked | B.left; worked | 
| C.has left; had worked | D.left; has worked | 
A new technique ____ out, the yields (收成) increased by 20% .
| A.having working | B.having been working | 
| C.has worked | D.had been worked | 
---What do you think of my suggestion?
 --- Sorry. What's that? I ____ about something else.
| A.thought | B.am thinking | C.was thinking | D.had thought |