So suddenly_______that the animals in the zoo looked very frightened during the total solar eclipse.
| A．did the sky turn dark | B．the sky did turn dark |
| C．turned the sky dark | D．was the sky turned dark |
When I miss my family, it’s ________ great comfort to have a ________ family to be with.
| A．a; substitute | B．a; replace | C．/; substitute | D．/; replace |
─They said that we would take a camping this weekend.
─________ it rains then?
| A．What if | B．What for | C．What about | D．How come |
Many people agree that __________ knowledge of English is a must in _____ international trade today.
| A．the, an | B．a, / | C．the, the | D．/, the |
It is a great concern that the school is now ____ for experienced teachers.
| A．badly in need | B．badly off | C．better off | D．struggling |
-- The cars give off a great deal of waste gas in the streets.
--- Yes. But I’m sure something will be done to ___ air pollution.
| A．reduce | B．remove | C．drop | D．warn |