Carelessness always contributes _______ car accidents. Therefore, drivers are advised to concentrate their attention _______ driving.
---Spacecraft “Discovery” has failed in the course of launch. ----_______? They have been preparing for the test.
--I didn't know this was a one-way street, officer.-----__________________.
He arrived here at noon, ________in the day, and he went out and came back ________ in the day.
--Which play shall we go and see?----__________________.
It was quite a long time_________ I made it out what had happened.