After many year of unsuccessfully endeavoring to form his own orchestra, Glenn Miller finally achieved world fame in 1939 as a big band leader.
Giải chi tiết:
endeavoring = nỗ lực
A. yêu cầu
B. cố gắng
C. cung cấp
D. quyết định
Around 150 B.C. the Greek astronomer Hipparchus developed a system to classify stars according to brightness.
Biogas can be utilized for electricity production, cooking, space heating, water heating and process heating.