The young mother often _________ her child alone at home.

----- Why is Mr . Yang still in the teachers’office ?---- Maybe he _______ his work yet .

The girl spends at least as much time singing as she __________.

-- I called you this morning, but nobody answered.-- Sorry. I ________ the flowers in the garden.

-- What a pity! You missed the beginning of the movie, it __ for 10 minutes.-- Oh, a traffic jam!