41, You (remember)___________ my name or you (forget) __________ it someday? 42, Tom (study) ___________chemistry for three years and then he gave it up. 43, Miss Lee often (write) ____________ when he (be)__________ young 44, He (leave) __________ home two weeks ago and we (not hear)____________ from him since then 45, You (speak) __________ to Mrs.Bakers yesterday? No, I (not see) __________ her for a long time\ I (not can) ___________ remember when I last (see) __________ her 46, When the teacher came in, the pupils (play)__________ games 47, Columbus (discover)____________ America more than 400 years ago 48, By the next month, I (finish)_________ my first novel 49, By May 5, we (live) ________ in this city for ten years 50, When your father (die) ____________?