So far we have done a lot to build a low-carbon economy, but it is _______ ideal. We have to work still harder.
A．next to B．far from C．out of D．due to
---I heard Tom was badly injured in the football match.
----________, let’s go and see him.
A．If not B．If any C．If so D．If ever
Scientists have found it seems _______animals and humans are much alike than we thought.
A．as though B．even though C．only if D．even if
Parents should see to it _______ their children form the habit of brushing their teeth every day.
A．this B．that C．whether D．if
The computer system _______suddenly while he was searching for information on the Internet.
A．broke out B．broke up C．broke in D．broke down
What fun it is to walk alone with full moon hanging in the sky.
A．/; a B．a; / C．the; / D．a ;the
