Lin Tao， a student of Grade 9， is ________ boy in our school． （ ）
A．tallB．taller
C．the tallest
Where is your uncle，Jane？
He is in Guangzhou．He ______ for a month．（ ）
A．has leftB．has gone
C．leftD．has been away
Chinese people find ______ our duty to help develop African countries along the Belt and Road （一带一路）．（ ）
A．itB．thisC．thatD．these
______ 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