آزمون آنلاین زبان انگلیسی 2 - درس دوم | آزمون شماره 5235

I ……… the difference between the simple past tense and the present perfect tense yet.

He finished his food and ordered another ........ .

...................................... Sharon's favorite activity since she was five years old.

.The manager of the company always .......................... the importance of being careful and polite in this job