. It is difficult for us to learn a lesson in life __________ we’ve actually had that lesson.
Cars do cause us some health problems—in fact far more serious _______ than mobile phones do.
Her mother was ill so she had to look after her________.
You’ll have to wait for one more week,________ the manager will be back from his trip.
She looks forward every spring to _______ the flower-lined garden. A.visit B.paying a visit C. walk in C.walking in
What a hard life they______! You should have helped them.