— It’s my treat today. Is there anything particular you would like to have?—______ you choose is fine with me.

The problem with seeing famous tourist attractions is the steady＿of people all trying to see the place at the same time, so I doubt whether it is worth it.

Bear in ______ that tomorrow is our dear mother’s birthday.

 Achieving a high degree of proficiency(精通）in English as a foreign language is   not a mysterious _______ without scientific basis.

_______ has been known that ______ other waste found in the ocean, the plastic  does not break down.