write questions using 'How long..' and the present perfect tense "for" and "since"
example:
How long has David worked for them?
1. you/wait/for the match to start
2. Susan/play/the piano
3. he/be/coaching/the football team
4. the boys/practice/in the rain
5. she/live/in the hostel
6. the children/watch/TV today
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Answer:
Carbon is a chemical element with the symbol C and atomic number 6. It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds. It belongs to group 14 of the periodic table. Carbon makes up only about 0.025 percent of Earth's crust
Explanation:
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