Mountain climbing ______ be really dangerous at times even though it is challenging and exciting in general.

— Is Kate coming to the party this evening?— No, she _________ be the party. She________ to the UK.

—Why, my new computer is rubbish! Five hours has passed and it still hasn’t finished the downloading. —Don’t worry. You know, sometimes the Internet ________ be very slow.

Tom, along with three other boys,     seen playing football a moment ago.

My newly- purchased bag is nowhere to be found.____ I have left it on the bus?