My dad ________ a teacher when I grow up .

Lawrence Craven, a doctor from the USA, is the author of several published reports, one of ________ introduced the idea in 1953 _________ aspirin could reduce the risk of heart attacks.

The successful launch of Shenzhou VII must have immediately excited the Chinese, ____ it ?

_______ he didn’t help me with my work. Instead, just _______.

Many countries have alot of rockets into space.