It is difficult for us to learn a lesson in life __________ we’ve actually had that lesson.
| A．until | B．after | C．since | D．when |
. Jenny hopes that Mr. Smith will suggest a good way to have her written English __________ in a short period.
| A．improved | B．improving |
| C．to improve | D．improve |
. — Did Peter fix the computer himself?
— He __________, because he doesn’t know much about computers.
| A．has it fixed | B．had fixed it |
| C．had it fixed | D．fixed it |
. John received an invitation to dinner, and with his work __________, he gladly accepted it.
| A．finished | B．finishing |
| C．having finished | D．was finished |
. My parents have always made me __________ about myself, even when I was twelve.
| A．feeling well | B．feeling good |
| C．feel well | D．feel good |
. The glass doors have taken the place of the wooden ones at the entrance, __________ in the natural light during the day.
| A．to let | B．letting |
| C．let | D．having let |