1/ If people solve the problem of smoke from vehiches, the air_______ pure and fresh A is B was C will be D would be 2/ If you post false information on the Internet, you_________fined A get's B got C would get D will get 3/ I believe that if all the people______the government's instructions, we_____covid-19 from spreading A don't follow /will prevent B followed /will prevent C follow/ would prevent D follow/ will prevent 4/Do you think there would be less conflict in the world if all people_______the some language? A spoke B would try C tried D will try 5/ If our schools are still closed because of the pandemic, we_______to study online A wouldn't B would try C tried D will try 6/If I _____you,I_____ many subjects online Instead of playing video games A was/will study B am / will study C were/ would study D am/ would study 7/ If people need more paper, more trees_____ A will cut down B cut down C will be cut down D are cutting down 8/ My English is not good. If I _____ English well, I________able to get a good job in a foreigh company A speak / can be B spoke/ were C spear/ were D spoke/ would be 9/ If everybody________to the fight against covid-19 , we will win soon A contribute B contributes C are contributing D is contributed 10/ If people protect the forest, a lot of trees___ A will be preserved B will preserve C preserve D would preserve 11/ If you were me, what_____? A you would do B will you do C do you do D would you do 12/ people don't trust him because he tells lies A If he tells lies, people would trust him B If he didn't tell lise, people would trust him C If he doesn't tell lise, people will trust him D If he told lies, people woulsn't trust him 14/ wear a face mask when you are with many people, or you will be at risk A If you wear a face mask when you are with many people, you will be at risk B If you don't wear a face mask when you are with many people, you will be at risk C If you didn't wear a face mask when you are with many people, you would be at risk D If you don't wear a face mask when you are with many people, you would be at risk 18/ we/ should / maintain/ personal space/ avoid/ crowds/ If / we / want/ be/ safe/ now A we should be maintained personal space and avoid crowds if we want to be safe now B we should maintalin personal space and avoid crowds if we want to be safe now C we should maintalin personal space and avoid crowds if we wanted to be safe now D we should maintalin personl space to avoid crowds if we want be safe now 19/ Her English / not/ be/ rusty/ she / used / more often A Her English wouldn't be rusty if she uses it more often B Her English wouldn't be rusty if she has used it more often C Her English wouldn't be rusty if she is using it more often D Her English wouldn't be rusty if she used it more often