1. It looks like rain, so you'd better ______ without an umbrella.

A. go             B. not to go    C. going  D. not go

2. The children are full of ______. They have been playing all day long without resting.

A. force         B. power C. energy       D. strength

3 She became fatter and fatter, so the doctor advised her  ______.

A. losing weight     B. to lose weight   C. to keep weight  D. to gain weight

4. Since your brother is in trouble, you ______ give him a hand.

A. need          B. could    C. might     D. should

5. —Let's go to a movie after work, OK?

   — _____________

   A. Not at all.      B. Why not?   C. Never mind.     D. What of it?

6. I was really anxious about you. You _______ home without a word.

   A. mustn't leave      B. shouldn't have left   C. couldn't have left    D. needn't leave