Many astudentthat mistake before.

The police always take advantage of dogs’ ____ sense of smell to search for something.

It can be ______ to swim in a strange place.—I think so. We should swim with our parents or in a swimming poo1.

Mark works outside and he is always ____ about the health of his aging parents. [ ]

Internet is a useful tool in our daily life, but it shouldn’t take the place of our ____ life. [ ]