I was about to sail away ______ I heard the sound of stamping and singing on the bank,
| A．when | B．while | C．as | D．the instant |
We should learn from those _____ are always ready to help others.
| A．who | B．whom | C．they | D．that |
Friends should be_____ about each other’s feelings.
| A．crazy | B．hidden | C．concerned | D．worried |
He _____ a Party member last year.
| A．joined | B．joined in | C．took part in | D．became |
Professor Smith, along with his assistants, _____on the project day and night to meet the deadline.
| A．work | B．working | C．is working | D．are working |
The Sound of Music is the first English filmI have ever seen.
| A．which | B．that | C．when | D．what |