Hiện tại hoàn thành thời chuyên hạng luyện tập

1.he's never been abroad since 1980
2.she's never had mango before,have you?
3.I've read this book,but I didn't understand it
4.I've just taken the French exam
5.I've got 12 letters until this morning
6.Has George brought his wife the flowers?No,he hasn't.
7.I've learnt english for 5 years.I've learnt it since 2002
8.I haven't seen Lan these days,he's gong to Canada again.He's been there for 3 times this year,he went there in May and August.
9.We haven't got imformation about him up to now
10.It's been fine since March