People in the west make_______a rule to buy Christmas presents for their friends.

— Who helped Li Lei with his English?   —         , he learnt it by himself. 

—Tom failed again in the driving test. ---Why not? Tom is ____ but a fool in driving.

Everyone knows that _______ is dangerous to play with fire, but _______ is difficult is to prevent children from playing with fire.

---What kind of house would you like? ---I’d like____ with a swimming pool at the back of ______.