I think Guilin is a beautiful city. —I agree with you. You can see boats go ______ he river and cars run ______ the city at the same time.

_______ by keeping down costs will Power Data hold its advantage over other companies.

All the students are busy _____English in the morning.

That is the third time John ______ the award in this field. [ ]

Keep the machine _______, and you will know how it works.