Being afraid of falling behind the times, he has always been keeping himself ___ of the latestdevelopment of technology. [ ]

Ihad just stepped out of the bathroom and was busily drying myself with a towel I heard the steps.[ ]

Both Class 3 and our class won’t be able tofinish the work unless they ___ each other.

How do you say 15,858

your touraround the North Lake Is it beautiful—It_______ be, but it is now heavily polluted.