This villa belongs to a diamond merchant / client.
→ merchant (người buôn kim cương, phù hợp hơn "client" - khách hàng).

The architect’s share / fee is very high.
→ fee (phí của kiến trúc sư, "share" không hợp lý trong ngữ cảnh này).

Motorcyclists are required by law to wear a helmet / gun.
→ helmet (mũ bảo hiểm, "gun" không hợp lý).

What amount / altitude of money do you have to pay back to the bank every month?
→ amount (lượng tiền, "altitude" nghĩa là độ cao, không phù hợp).

A thief grabbed / indicated two mobile phones from the table and quickly ran out of the café.
→ grabbed (giật lấy, "indicated" nghĩa là chỉ ra, không hợp lý).

Six people were injured when a bomb went off / packed with / bubbled up / brought up near an army camp last night.
→ went off (phát nổ, phù hợp với "bomb").

What is the minimum / optimistic / active / low amount you are selling your car for?
→ minimum (số tiền tối thiểu).