It is because people are likely to stay indoors ______ the virus can spread easily ______ people often catch colds.
–Shall we meet at 6:00 or at 6:30? -__________.
I won’t give my help ______ you will tell me the truth.
Although there were so many people in the square, I could ______ my friend.
Jane is not ____ she was ten years ago. She has changed so much.
China as well as the other two super countries _____ sent a man into ____ space.