A clean environment can help the city bid for the Olympics, which ______ will promote its economic development.
Look! It’s getting cloudy. I’m sure it _____.
We will go shopping if it____ tomorrow.
Hurry up ! The train _____ . You know it _____ at 8:30 a.m .
They _______ a meeting when the earthquake happened.
The farmers _____ a lot _____ the flood because it rained heavily .