Would you like to go hiking with us—Sorry. My grandmother is ill. I’ll go to her.

The word “ungelivto English vocabulary.

Parents should see to it _______ their children formthe habit of brushing their teeth every day

The young scientist has made such great achievements in his chosen field ______ nobody else can make.

This week, the _______ seems to change every day: one day is hot; the next day is cold.