He is very popular among his students as he al-ways tries to make them _______in his lectures.
| A．interested |
| B．interesting |
| C．interest |
| D．to interest |
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 |
Air is to us _____ water is to fish.
| A．what | B．that | C．which | D．is that |