The world is changing fast. I strongly believe that one will easily fall behind he keeps on learning.
| A．unless | B．if | C．when | D．as |
____ I had done it I knew I had made a mistake.
| A．Hardly | B．Directly | C．mostly | D．Nearly |
I have a lot of books, half of____ novels.
| A．which | B．that | C．whom | D．them |
You can, ____, come to join us in the singing programme.
| A．if you happy | B．when you possible |
| C．if you please | D．when you necessary |
He came home after midnight, and____, he got drunk.
| A．worse still | B．that means |
| C．what’s the matter | D．what else |
---Could I borrow your motor bike? ----Yes, of course, you____.
| A．might | B．could | C．can | D．should |