Complete the sentences with the correct present or past forms of the verbs in brackets. Use passive or active forms.
1. We __ (use) walk as a verb or a noun in English.
2. The flat __ (not/clean) yet and it looks very dirty.
3. __ (Thomas Edison/invent) the first light bulb?
4. Last year the British Museum __ (visit) by 6 million people.
5. In my city rubbish __ (not/collect) on Sundays.
6. The children __ (not/eat) anything for eight hours.