On ______ Children's Day，Jack received a prize for being ______ honest boy．（　　）

A．the； anB．/； anC．/； aD．the； a

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

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

To the teacher's joy，the student made great ______ this term．（　　）

A．resultB．preparation

C．suggestionD．progress

______ 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