Only in this way ____to make an improvement in the operating system.
| A．you can hope | B．you did hope | C．can you hope | D．did you hope |
Helen always helps her mother even though going to school_______ most of her day.
| A．takes up | B．makes up | C．saves up | D．puts up |
She will fly to Washington, ________ she can enjoy herself.
| A．that | B．which | C．where | D．/ |
These experiences ______ me _____ the drug’s harmful effects.
| A．are convinced; by | B．convinced; of | C．were convinced; by | D．convinced; at |
— Did Alan enjoy seeing his old friends yesterday?
— Yes, he did. He _____ his old friends for a long time.
| A．didn’t see | B．wouldn’t see | C．hasn’t seen | D．hadn’t seen |
— Have you handed in your schoolwork yet?
— Yes, I have. I guess it ______ now.
| A．has graded | B． is graded | C． is being graded | D． is grading |