________________ the great achievements of the science, what we’ve done is nothing.
. I ______ pay Tom a visit, but I am not sure whether I will have time this Sunday.
-Mary didn’t turn up last time, did she?-No. She ______ . We had changed our plan.
They must have finished the work by the end of last month, ______?
-I didn’t know you were good friends.-You ______. I have known her since she moved here. You were studying abroad then.
.-Is there any flight to Tokyo today?-I think there ______, for the weather is too bad.