1.People grow rice in tropical countries
\(\rightarrow\).............................................................
2.Hoa doesn't do the housework often
\(\rightarrow\).............................................................
3.They didn't by vegatables on the wat home
\(\rightarrow\)................................................................
4.I haven't used the labtop before
\(\rightarrow\)..................................................................
5.We have read this book three times
\(\rightarrow\)......................................................................
6.How long have you learnt French
\(\rightarrow\)...................................................................
7.They couldn't continue the match because of the bad weather
\(\rightarrow\)..........................................................................
8.He can speak three languages
\(\rightarrow\)..............................................................................
9.You should do the exercise carefully
\(\rightarrow\)..............................................................................
10.They have sold the house
\(\rightarrow\)..................................................................
11.They took the old man to hospital
\(\rightarrow\).........................................................................
12.Someone has opened this letter
\(\rightarrow\)..................................................................
13.They should reduce air pollution
\(\rightarrow\).....................................................................