A:take u
B:carry u
C:pick u
D:make u
—It ____________ be him. He is abroad right now.
亚洲地形、地势的特点是( )
调查时首先要明确____和____,制定合理的____.调查的范围很大时,就要进行____,调查过程中要如实____.对调查的结果要进行____和____,有时要用数学方法进行统计.