Сопоставьте время глагола и временное выражение (некоторые используются дважды):

you mustn't open the door for a stranger. a stranger should trick you. you might answer the phone. you don't have to tell everybody that you are home alone . you must know your parents' phone number. it have to be wise to know your neighbours .

africa -  africanindia -  indiantropic - tropical

здесь нужно вставить since or for!

так вот: 1. since 2. for 3. for 4. for 5. since 6. since 7. for 8. since это точно правильно)

1. shorter 2. best 3. many 4. more modern 5. sunnier 6. happier .