—Has your friend completed his design?
—Not yet. He _______ on it last night.
| A．worked | B．has worked |
| C．is working | D．was working |
Johan didn’t review（复习） the lesson, ___ he couldn’t answer the teacher’s question.
| A．as a result | B．such as | C．because of | D．as well as |
---- My mother is ill in hospital?
---- _________.
| A．I don’t think so. |
| B．Oh, she is unlucky. |
| C．No problem. |
| D．I’m sorry to hear that. |
---- Do you know Jack well?
---- Certainly, we _________ friends since ten years ago.
| A．were | B．have made | C．have become | D．have been |
The box is too heavy for me _________.
| A．carrying | B．carries | C．carry | D．to carry |
It _________ rain this afternoon, but I am not sure.
| A．will | B．can | C．must | D．may |