More attention should be ________ the equipment in our factory so that we can increase our production.[ ]

Theofficephonesaredirtyandthey_______nextweek

May I have some more tea with sugar，please—I’m sorry，but there doesn’t seem to be________.

Since here it’s too hot for you，you may ________ go to work in a seaside city

It’s _________ useful dictionary and you can’t throw it away . —Thank you . I didn’t know it before .