'Your son has been with his girlfriend for a long time. Any sign of wedding bells?' -'Well, I'm not sure, but I think he....(ask) her to marry him on their holiday next week.'
will ask/is going to ask
'Can I have your report this afternoon?' - 'This afternoon? Oh, I don't think I ...(finish) by then.'
will have finished
Look at the waiter. He's carrying too much. He...(drop) all those plates.
is going to drop