一个口袋中有红球、白球共20个，这些球除颜色外都相同，将口袋中的球搅匀，从中随机摸出一个球，记下它的颜色后再放回口袋中，不断重复这一过程，共摸了300次球，发现有120次摸到红球，则这个口袋中红球的个数约为____．
8
The family ___ at the lunch table when someone came to tell them what had happened at ___.
I called you just now, but you weren't in. Sorry, I ______ the reading room.
I will give ______ students ______ minutes for them to finish their exercise
Every morning, WE are asked ______ taken our temperatures.
She ______ his number in the phone book to make sure that she had got it right.
I will spend as much time as I ______ the lesson.
He's never stolen anything before, ______ he? ______. It's his third time to be taken to police station.
Has Jack finished his homework yet? I've no idea, But he ______ it the whole afternoon.
______did you sleep last night? I was reading too late to fall asleep.
Have you ______ your father recently? No. He doesn't often write to me.
