______ riding shared bikes（共享单车） is an environmentally friendly way to travel，many of the bikes are thrown everywhere．（ ）
A．AlthoughB．AsC．UnlessD．Until
To the teacher's joy，the student made great ______ this term．（ ）
A．resultB．preparation
C．suggestionD．progress
Daddy，I've run out of my pocket money．I spent 100 yuan ______ some favorite books．
OK．Here you are．But make sure you save money as well．（ ）
A．forB．onC．withD．at
Janet is sleeping at home．
She ______ be．I went for a walk with her just now．（ ）
A．can'tB．mustn'tC．needn'tD．won't
On ______ Children's Day，Jack received a prize for being ______ honest boy．（ ）
A．the； anB．/； anC．/； aD．the； a