He doesn't know_________ the work by himself.
| A．whether can he finish | B．whether he could finish |
| C．whether can how finish | D．whether he can finish |
Oh, great changes have taken place I graduated from our school in 2004.
| A．until | B．before | C．since | D．Unless |
Cheer up! Don’t get beaten by difficulties. , we are new to the work.
| A．In all | B．At all | C．Above all | D．After all |
We students should work hard at school, because what we are learning today later in our life.
| A．will be paid | B．was being paid |
| C．has been paid | D．was paid |
May I have your attention, ladies and gentlemen? The plane in fifteen minutes. Please power off your cell phones.
| A．was taking off | B．is taking off |
| C．has taken off | D．took off |
Mary is a warm-hearted lady. She is ready to help others, but never expects anything .
| A．in trouble | B．in charge |
| C．in peace | D．in return |