The sentences provided seem to be exercises related to connecting sentences using relative pronouns or relative clauses. In English, relative clauses are used to provide additional information about a noun without starting a new sentence. Here's how each sentence pair could be combined:
Jane wore a beautiful dress yesterday. Did you see it?
You could combine these sentences using a relative pronoun like 'which': 'Did you see the beautiful dress which Jane wore yesterday?'
We spent our holiday in Hoa Binh last year. Hoa Binh is in the north of Vietnam.
Combine these using 'which' or 'that': 'We spent our holiday in Hoa Binh, which is in the north of Vietnam, last year.'
We first went to Bangkok. It is the capital of Thailand.
Use 'which' or 'that' to combine the sentences: 'We first went to Bangkok, which is the capital of Thailand.'
Jane invited lots of classmates. Most of the classmates came to her party.
These can be combined with 'who': 'Jane invited lots of classmates, most of whom came to her party.'
These are the documents. I told you to type them.
Use 'which' to combine these: 'These are the documents which I told you to type.'
In these combinations, the relative clauses provide additional information about the noun, enhancing the sentences and ensuring they flow smoothly.