--- Has James finished his report on his Enquiry Learning yet?\
---- I’m not sure. He _____ on it last week.
| A．was working | B．has worked | C．worked | D．had worked |
Young as he is, David has gained ____ rich experience in ____ society.
| A．the; the | B．a; 不填 | C．不填；不填 | D．不填；the |
We had a really bad time about six months ago but now things are ____.
| A．looking up | B．coming up | C．making up | D．turning up |
Now that we ____ all the money, it’s no use turning on me and saying it’s all my fault.
| A．had lost | B．lost | C．have lost | D．lose |
Thank you for sending us ____ fresh vegetables of many kinds. You have done us ____ a great service.
| A．不填；a | B．the；a | C．不填；不填 | D．the；不填 |
___ nearly all behavior is learned behavior is a basic assumption of social scientists.
| A．/ | B．That | C．It is acceptable | D．When |