Open the brackets.use the present perfect tense
1)we (learn) a lot of new words since last year
2)mrs olivier (live) in boston since last year
3)John (lose) his keys
4)lately ben (not attend) the class meetings regularly
5)I (be) very busy this week
6)he (already/finish) his work
7)professor higgins (never/teach) in this university before
8)they (move) to New York
9)it`s mum`s birthday tomorrow,but I (not/buy) her a present
10)they are not at home now.they (go out)