China began to open to the outside world in the late 1970s. _________, there have been great changes in the country.

What’s the matter with Tim——Oh, Tim’s cell phone was left in ataxi accidentally, never ________ again.

do you find his new novel — His previous ones are great, and I think this one is_____ worth reading.

This is ______ my parents are worrying about.

The second Sunday of May is Mother’s Day and a time to be to our mothers.