[多选题]如果合同双方对债务的履行期限没有约定好，那么下列说法正确的是：
A.债务人可以随时履行
B.债权人可以随时请求履行
C.既然没有约定时间，就可以在任何时候要求立即履行不得迟延
D.合同任一方都可以自行决定履行时间然后通知对方给予适当准备时间

Driving through snowstorm on icy roads for long distances is a most nerve-racking experience. It is a paradox that the snow, coming (1) gently, blowing gleefully in a high wind, all the while (2) down a treacherous carpet, freezes the windows, (3) the view. The might of automated man is (4) . The horses, the powerful electrical systems, the deep-tread tires, all go (5) nothing. One minute the road feels (6) ,and the next the driver is sliding over it, light as a (7) ,in a panic, wondering what the heavy trailer trucks coming up (8) the rear are going to do. The trucks are like (9) when you have to pass them, not at sixty or seventy (10) you do when the road is dry, but at twenty-five and thirty. (11) their engines sound unnaturally loud. Snow, slush and (12) of ice spray from beneath the wheels, obscure the windshield, and rattle (13) your car. Beneath the wheels there is plenty of (14
A. sheer
B. mostly
C. rarely
D. right