The only word that can be used before “chalk" is 

Questões de assuntos semelhantes

• The plural of the word ocean is:
• Which noun does not have the correct spelling on its plural form? Choose the incorrect answer. (Countable and Uncountable Nouns)
• All the nouns below have their correct plural form, EXCEPT for one set. Choose the INCORRECT set. 
• According to the text, judge the item from. The word “crop” is mentioned several times in the text. One of its meanings can be expressed as the...
• “Tyger Tyger, burning bright, In the forests of the night; What immortal hand or eye, Could frame thy fearful symmetry?”In terms of English...