=1.while we were staying in hanoi , we visited many places                                                                =2.It is the first time she has been done such a complicated exam                                                        =3.he hasn't eaten dog meat for 20 years .                                                                                               = 4.nam hasn't spoken to lan for 2 years                                                                                                   = 5.it's the fourth time he has watched this action movie                                                                     =6.i have not smoked cigarette since 2001                                                                                          =7.During the/our visit of London , we accidentally saw the Queen.                                                   =8.It has been 2 years since we visited our grandparent’s village                                                       =9.while his parents was sleeping , he came back home.                                                                     =10.If you don't work hard enough, you won't become good at english

1. We visited many places of interest during our stay in Hanoi.
While ……staying in hanoi, we visited.....
2. She has never done such a complicated exam before.
It is ……the first time she has ever done sucha complicated exam 
3. It was 20 years ago when he ate dog meat for the last time.
He hasn’t …………eaten dog meat for 20 years
4. It’s two years since Nam last spoke to Lan.
Nam hasn’t …spoken to lan for 2 years 
5. He has watched this action movie four times.
It’s ………the fourth times he has watched this action movie
6. The last time I smoked cigarette was in 2001.
I ……haven't smoked cigarette since 2001
7. While we were visiting London, we accidentally saw the Queen.
During ………our visiting in london, we accidentally....
8. The last time we visited our grandparent’s village was 7 years ago.
It has ………been 7 years since we last visited....
9. He came back home and saw his parents sleeping.
While his parents ……were sleeping, he came home
10.  You will become good at English with enough hard work.
If you don’t ……work hard enough, you won't become....