I have no idea ________ the cell phone isn’t working, so could you fix it for me?

l be a big help if you go to the store and getwhat we need for dinner. _____, I’ll set the table.

Believe it or not, I passed the driving test at the first attempt yesterday— Great! But remember you can never be ___ careful when driving a car in the street

_________ does your mother go for a walk — Every afternoon.

________in a heavy traffic jam in a taxiwhile you are hurrying to the airport is quite an unpleasant experience．