[填空题]His suggestions turned out to be very (effect) _______ in the improvement of our production.

[填空题]His suggestions turned out to be very (effect) _______ in the improvement of our production.

[填空题]His theory turned out to be very (effect) ______ to improve our experiment.

[单项选择]His parents out （） this evening.
A. all are
B. are all
C. both are
D. are both

[单项选择]John liked to wear his hair very long. Some of his friends thought it looked like a girl’s hair, but they never made jokes (玩笑) about it, because John was a big, strong man, and he didn’t think jokes about his hair funny(有趣的)。
John always went to the barber’s (理发店)twice a month to have his hair cut and washed,and one day the barber said to him,"Now why don’t you let me cut most of this hair off and make your head tidy(整洁) Nobody would recognize(认出)you if I had that,I am sure."
John said nothing for a few seconds,and then he said. "Perhaps you are right,but I am sure that nobody would recognize you. either, if you did that to my hair./

John kept long hair because ______.
A. John was a girl
B. the barber wouldn’t like to cut it short
C. John liked it to be long

[填空题]Mr. Bellavance cashed out his pension, sold his house and unloaded things he didn’t need at garage sales after losing his job in order to ______.