I’m not sure ___ I can learn at present; but I’m sure it will be something ___ I might use in the future.
----I wonder why Mary is so unfriendly to us. ----She is _____ than unfriendly, I’m afraid.
----How about your trip to Hainan? ----It couldn’t have been _____. Sometimes I went swimming in the sea; sometimes I lay on the sand.
----I didn’t do well in this English examination. How about you? ----I did _____ you.