1/ have you sent the letter yet?

2/ Nile is the longest river in the world
3/ Hoa's salary is higher than Tom's
4/ He works hard in order to pass the exam
5/ Early this morning, chidren decide to go a run
6/ Sydney Opera is completed in 1973
7/ The road joined the two villages is very narrow.
8/ It's not difficult to translate this sentences into English
9/ Would you mind lending me the dictionary?
10/ New bicycle made in Japnan is expensive
11/ Have you seen the film called Jurassic Park yet?
12/ The Mekong river is longer than the Red river
13/ Ba is more intelligent than Nam
14/ Sear Tower is shorter than PETRONAS Twin Towers
15/ Mexico city is the bigest city in the world