This is______ difficult problem that few students can work it out.
We _________ the books to the library after we read them.
returned
pointed
waved
caught
Many people think eating at home is ________ than eating in the restaurant.
healthy
healthier
healthiest
the healthiest
We feel ________ to win the match because we are training hard.
lonely
sorry
confident
strange
It _________ be the only way to solve the problem. There are other choices.
may not
mustn’t
need
should
Don’t speak loudly on the bus. You should keep your _________ down.
body
voice
interest
service