Not only the engineer but also his enemies ____________breaking into several computer systems last year.
| A．was guilty of | B．were charged with |
| C．were guilty with | D．was charged of |
She kept _________ hard at her physics and finally caught up with us.
| A．work | B．worked | C．working | D．to work |
--- ________ you play international chess?
--- No, I can’t. But I can play Chinese chess.
| A．Must | B．Need | C．May | D．Can |
--- __________ are all these together?
--- 425 yuan.
| A．How much | B．How many | C．How long | D．How often |
Spring is coming and there ________ flowers everywhere.
| A．is | B．are | C．was | D．were |
--- Can you come and play with us this evening?
--- I’d love to, ___________I have a lot of homework to do.
| A．and | B．so | C．or | D．but |