آزمون آنلاین زبان انگلیسی 2 - درس دوم | آزمون شماره 4819

The doctor knows how to calm her down because he ........... a great deal of surgery since 1974.

 I need to have a ................... quick about what I'll have for lunch , since the cafeteria has no sandwiches. no 
 

.I don't think some children understand how much time mothers spend ......................... the meal

According to the last researches the first wind ......................... was used in ancient Persia.