语法填空Complete the following sentences, using the right verb forms.1)Up to now, we ______________ (not receive) any news from her.2) I had intended to call on you yesterday, but someone __________ (come) to see me.3) As a school boy I already knew the sun ___ (be) the center of the solar system.4) I have worked here since I __________ (graduate) from college.5) By the time you get back, great changes __________________ (take place) in this area.6) She told me her name only after I __________ (ask) her twice.7) He said he _______________ (write) a report since two o'clock that morning.8) When she was here, she always __________ (complain) about the living condition.9) That was the second time I __________ (be) abroad.10) I _______________ (watch) my favorite TV show at seven o'clock this evening.