As we all know ,Columbus America and Edison light bulbs.
| A．discovered ; invented | B．invented ; discovered |
| C．discovered ; discovered | D．invented ; invented |
The boys when the teacher came in. So she was very angry．
| A．were doing homework |
| B．were cleaning the classroom |
| C．were fighting |
| D．were learning English |
I spent two days _____ reading the storybook.
| A．finish | B．finished |
| C．finishing | D．to finish |
He had little bread for breakfast this morning,___________ he?
| A．had | B．did | C．hadn’t | D．didn’t |
This is the computer ________ Mum gave me for my birthday．
| A．which | B．what | C．whose | D．whom |
．— I wonder if you _______ a picnic tomorrow.
— Yes. But if it ______, we’ll visit the museum instead.
| A．have; rains | B．will have; rains |
| C．have; will rain | D．will have; will rain |