My parents have always been _________ travelling whenever they get the chance.
| A．curious about | B．pleased with |
| C．concerned about | D．keen on |
My brother tried ___, but still he couldn't work out this maths problem.
| A．a great deal of | B．a great deal | C．a number of | D．lots of |
He seemed as if he ___ his homework when his mother came in.
| A．did | B．is to be doing | C．were doing | D．be doing |
The poster says that a writer and poet ___ to give us a talk on English next week.
| A．is | B．are | C．be | D．will be |
How this kind of plant can be ____ in a special way is still unknown to us.
| A．kept away | B．kept out | C．kept alive | D．kept off |
If I ___ free tonight, I'll go to the cinema with you.
| A．am | B．was | C．will be | D．be |