Peter Parker participated in a science exhibition, ______ he was accidentally bitten by a spider ______ was exposed to radiation (辐射) .

Not until recently _______ paid workoutside the home

The plane couldn’t take off on time _____ the heavy rain.

At the endof the day we can gather our guests to enjoy fine wine— You seem tobe getting off the point How is that _______ to this discussion

Teenagers should ________ to take care of themselves from a young age.