ipes have oil or water inside them, which is heated and sent to the storage tank until ______ to produce electricity.

Since then the population of London________by almost 50,000 a year—an increase largely fuelled by immigration

If you had joined the chat room ten minutes ago, you _____ what we were talking about.

Why are you late again—Something happened to our friend Wang Fei I _____ tohelp him

st Sunday, My friend and I drove tothe Summer Palace in Beijing We found there were so many cars here and thereand we couldn’t find a place to _______ the car in