Answer:
a. We <u>used to</u> go to school together.
b. How did you <u>use to</u> spend the winter evenings?
c. We <u>used to </u>have our milk delivered.
d. I <u>used to</u> be in love with him.
e. At one time there <u>used to</u> be trees in the garden.
Answer:
The concentration of a solution means the amount of solute present in a given or specific amount of solution. (presented in percentage)
For example, the Normal Saline solution normally used for different scientific experiment or so. The saline water has 0.9% of salt (sodium chloride). This is the concentration of solution of salt.
The basic purpose of a google calendar is basically the same as a regular calendar. it is used to keep track life's important events all in one place.