Sam _____ some knowledge of the computer just bywatching others working on it

I’m looking forward ________ a trip to Mount Tai.[ ]

Jerry did not regret giving the comment but felt ______ he could have expressed it differently[ ]

There must have been a large number of tourists in Sanya during the past Spring Festival, ________?[ ]

－Why are you in such a hurry, John－There ________ a basket ball match between Class Three and our class in ten minutes.