---Are you sure you have to do it? It’s been very late.-----I don’t know ________I can do it if not now.A .where B. why C. when
There are lots of shops on _________ of the street.
I don’t know when he _________ tomorrow. If he _________, I’ll let you know.
Our teacher told us light (光) _________ much faster than sound .
--- Will you please fly a kite with me in the park this afternoon? ---_____. I will look after my sister.
---Could you tell me_________? ----About 6 o’clock.