I catch cold now and then.

A. always            B. occasionally               C. constantly           D. regularly

I catch cold now and then

1. A.
   always
2. B.
   occasionally
3. C.
   constantly
4. D.
   regularly

You _____ cold if you had put on more clothes the day before yesterday.

A．won’t catch      B．wouldn’t have caught                   C．hadn’t caught  D．haven’t caught

_____ I catch a cold, I have pain in my back.

_____I catch a cold, I have pain in my back.

A．Every time　　　　　　　　　　 B．ThoughC．Even D．Where