You _____be careful with the camera. It costs!
| A．must | B．may | C．can | D．will |
．Joining us in the program today __________Mr. Smith, together with his wife. Welcome to our program.
| A．was | B．are | C．is | D．were |
Robert Collier once said, “A single idea---the sudden flash of a thought
--- __________be worth a million dollars.”
| A．should | B．may | C．must | D．will |
．Some people would rather ride bikes as bike riding has______of the trouble of taking buses.
| A．nothing | B．some | C．neither | D．none |
．---I give up. It’s too hard.
---Really? I__________you could make it through.
| A．think | B．thought | C．have thought | D．am thinking |
．Walking together, my father and I used to have a lot of conversations I __________learned lessons from his experience.
| A．that | B．where | C．when | D．through which |