--- _______ the plane have taken off on time?
--- I’m afraid not. So many flights were delayed due to the bitterly cold weather.
| A．Will | B．Should |
| C．Can | D．Must |
To build a harmonious society, we all have a part to play in the fight ____ injustice, unemployment and crime.
| A．over | B．by | C．for | D．against |
This chemical material is very toxic. So put it ______ the children’s reach.
| A．by | B．beyond | C．within | D．from |
The central heating system of this office building is down and several workers ______ it right now.
| A．had repaired | B．have repaired | C．repaired | D． are repairing |
China's present environment situation is from bad to worse and if we _________ now to protect the environment, we’ll live to regret it.
| A．hadn’t acted | B．haven’t acted | C．don’t act | D．won’t act |
In recent years the consumption of aspirin _______ enormously in America.
A was increasing B. has increased C. had increased D. will be increasing