English Grammar Test 1 - the key

The videos, devoted to the topics are at the beginning of this playlists - https://www.youtube.com/playlist?list=PLCL8PrsNNVvfSnvV4jvvWJaR_Y7niTN2X
Here you will find the key to the English Grammar Test 1! Check your grammar and fill the gaps if you have any in your knowledge!
Study Russian and English weekly ;)