1.I’ll be going to work on foot while my bicycle-----.

1.I’ll be going to work on foot while my bicycle_____.(a) is being repaired (b) is repaired (c) will repaired (d) has been repaired2.The radar sets _____ for a long time without any trouble.(a) have been running (b) have been run(c) have run (d) were running3.While the ice box_____,a lot of defects were found.(a) was being examined (b) was examined (c) was examining (d) had been examined4.Do you remember _____ to Dr.Henry during your last visit?(a) to be introduced (b) being introduced (c)having introduced (d) to have introduced