`2, B.` however
`-` Clause 1. However, clause 2. (Tuy nhiên)

`3, A.` although
`-` Although/Even though/Though + clause 1, clause 2. (Mặc dù)

`4, B.` However
`-` Clause 1. However, clause 2. (Tuy nhiên)

`5, A.` Although
`-` Although/Even though/Though + clause 1, clause 2. (Mặc dù)

`6, A.` Although
`-` Although/Even though/Though + clause 1, clause 2. (Mặc dù)

`7, B.` Althoug7
`-` Although/Even though/Though + clause 1, clause 2. (Mặc dù)

`8, B.` However
`-` Clause 1. However, clause 2. (Tuy nhiên)

`9, A.` in spite of
`-` In spite of/Despite + N/N phrase/V-ing, clause. (Mặc dù)

`10, B.` However
`-` Clause 1. However, clause 2. (Tuy nhiên)