Scientists are trying their best to_______ ways to treat the terrible disease caused by Ebola(埃博拉).
___you_____to the beach this summer vacation? No ,I went to the village.
I bought _____in that shop,because_____there was very expensive.
Mom ,can I go to play soccer with Jim?It ’s up _______ you .
____salad do you want ? Just a little .
There is a lot of delicious food ,so please help _____.