1.In warm weather fruit and meat__long.
A don't keep B cannot be kept C are not kept
D are not keeping
2.Your radio doesn't work.The plug__.Just plug it in.
A isn't connecting B hasn't connect
C doesn't connect isn't connected
3.-Did you telephone the governor's office?
-Yes,he__back before tomorrow noon.
A expects B is expected C expected D is to expect

1.A.正确 keep的大多意思都是及物动词,但是它表示食物的保鲜时是不及物动词.
不及物动词没有被动语态,因为主动变被动的时候,主动句中的宾语要做被动
句中的主语,所以一个不能接宾语的谓语动词是不可能有被动形式的.
例如:John cooked the food last night.(主动句)
The food was cooked (by John )last night.(被动句)
这里的cook是及物动词,可以接宾语,才可以变被动,用它的宾语做被动的主语.
In warm weather fruit and meat(don't keep )long.
你也可以这样理解:水果和食物在温暖的天气中不能保鲜很长时间.
(它自己有一定的保质期,如果是被人为的保存,那么无论什么气候都可以长时间保存
所以我觉得一个动词被规定是及物还是不及物,是有它一定道理的)

2. D.isn't connected
3. B. is expected
你在看到这样的题时,先判断动词是否及物,然后在考虑用被动还是主动.