Hello dear students! Below you can find some activities to improve your skills.

Prepositions of place
http://www.englishexercises.org/makeagame/viewgame.asp?id=6568
http://www.englishexercises.org/makeagame/viewgame.asp?id=597
http://www.englishexercises.org/makeagame/viewgame.asp?id=5671

Present Continuous
http://www.englishexercises.org/makeagame/viewgame.asp?id=3438
http://www.englishexercises.org/makeagame/viewgame.asp?id=2126
http://www.englishexercises.org/makeagame/viewgame.asp?id=2332

Some/any/a/an
http://www.englishexercises.org/makeagame/viewgame.asp?id=2920
http://www.englishexercises.org/makeagame/viewgame.asp?id=3258
http://www.englishexercises.org/makeagame/viewgame.asp?id=5271