We still haven’t got a sponsor although the fact that we’ve written to dozens of companies.

→ Despite + the fact that

People in the South speak more direct than people in the North do.

→ Direct ( vì speak là động từ (V) phải đi với trạng từ (Adverb) ) 

Many people have been claimed that the show tickets are too expensive.

→ Have claimed ( Đây là thể chủ động, không phải bị động nên không thể dùng ''been'')

It’s well worth to go to Ha Long Bay as it is very picturesque.

→ Going ( be well worth + V-ing)

1.We still haven’t got a sponsor although the fact that we’ve written to dozens of companies.

→ Despite 

2.People in the South speak more direct than people in the North do.

→ Directly 

3.Many people have been claimed that the show tickets are too expensive.

→ Have claimed 

4.It’s well worth to go to Ha Long Bay as it is very picturesque.

→ Going