---Where have you been recently? --- I _______ in Hangzhou on business for a week last month.
Science and technology have __________ in important ways to the improvement of agricutural production.
It _________ you to at least 50% off the regular price of either frames or lenses when you buy both.
I hate people who __________ the end of a film that you haven’t seen before.
I had just posted the letter when I remembered that I hadn’t _________ the cheque.
The opening between the rocks was very narrow, but the boys managed to _______ through.