Plans have been proposed ______ the largest dam in the world to be built along the Congo river.
---Where is your report of this month?---Oh sorry,I______ to email to you.
She is always the first staff to go to the office and the last to leave,______ I guess is why she is promoted so quickly.
EBOLA(埃博拉) is said_______ another big health challenge to our humans over the past several months .
Nowadays ______idea is always flashing across his mind that he should fix______timefor another trip with his family.
______our students need in the process of their preparations for NMET is time, healthand perseverance,the teachers stress.