I always think it was such a(n) ______ for me to have spent a day with kids in the Children’s Home.

There might be life on other planets, but so far scientists haven't found enough ________ to prove it.

His letter was so confusing that I could hardly make any ______ of it.

I prefer to eat in that restaurant, because the ____ of service there has improved a lot.

 –What’s the matter, doctor? --Nothing serious. Take the medicine according to the ______.