The world’s population is getting larger and larger, so scientists will have to ______ new ways to solve food problem.
Lots of volunteers _______ the people there _______ help when an earthquake happens.
—Your shoes are so old. Why don’t you buy a new pair? —Because I _______ all my money on an MP5.
—I don’t like documentaries. —_______.
Jackson _______ school two years ago and he _______ for two years.
—_______ is the population of Brazil? —It’s 184 _______.