1. The test seems –. difficult ( be ) 2. Do you have = on duty today ? ( be ) 3. Bell and Watson first = the telephone i

1. The test seems ……… difficult ( be )
2. Do you have ………… on duty today ? ( be )
3. Bell and Watson first ………… the telephone in 11876 ( introduce )
4. I don’t know where the Sao Mai theater ………….. ( be )
5. It is not safe ………… medicine around the house ( leave )
6. Water ……… at 100 C ( boil )
7 . It’s better for us ………. water ( save )
8. She …………… hard but she can’t open the box ( try )
9. He started ………… with ways of transmitting speech over a long distance ( experiment )

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  1. 1. The test seems ...to be…... difficult.

    2. Do you have …to be.…….. on duty today?

    3. Bell and Watson first ……introduced…… the telephone in 1876

    4. I don’t know where the Sao Mai theatre…...is……..

    5. It is not safe ...to leave……… medicine around the house

    6. Water ...boils…… at 100 C

    7 . It’s better for us ....to save.….. water

    8. She ..tries…………. hard but she can’t open the box

    9. He started …to experience…….. with ways of transmitting speech over a long distance

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