Zhang Yining has trained continuously for six hours ______ she is tired out

When______ what his plan for his summer holiday was, he got very excited.

y hand-held Reader, I’ve read more booksin the past six months than I ________ in the past six years

It’s time that I my hair cut It’s the fifth time that I to the barber’s shop

You are not supposed to get off the bus________ it stops.