In 1948, three American scientists invented ____ transistor, which is ____ small electronic device to control an electric current.
----- how _____ are you driving now? -----A hundred miles an hour.
Tom tried to make his parents _____ by making faces.
-----May I speak to Mr Tom, please? ----- I’m afraid he isn’t in. Would you like to ______ a message?
-----Do you usually take a vacation? -----Yes, I like to go away______.
----- What made you so upset? -----_____ my house _____ saying goodbye.