I tried to call up my relatives in Kyrgyzstan where an unrest(动乱) was going on, but couldn’t _________.
--- Can you climb that tree, my boy? --- __________ ?
_________ always succeed.
--- What’s Joan doing? --- _________ newspapers in the room.
--- Mary didn’t attend the lecture, did she? --- Yes, she ________.
--- Will you waste your time and money on that? --- Certainly ________.