Neither of them thought highly of him and they both tried to _____ him in his work.
| A．hamper | B．support | C．depress | D．prevent |
We’re trying our best to get our English _____.
| A．improved | B．to improve |
| C．improves | D．improving |
Though some foreign scientists had a ______ opinion of his new invention, his fellow workers never thought ____ of it.
| A．highly; low | B．low; high |
| C．high; highly | D．poor; highly |
_____ people who buy IBM PC686 is larger than ever before.
| A．A lot of | B．A number of |
| C．A great many | D．The number of |
The poor boy is in danger. We should do all we _____ help him out.
| A．can do | B．can to | C．can to do | D．can |
Nobody but you _____ able to sing that American song.
| A．are | B．were | C．is | D．can be |