(   ) 2. Don't be afraid of       mistakes when you speak English.

   A. taking   B. doing

   C. making   D. offering

(   ) 1. - I       it out in this way,but I failed.

―Why      it in another way?

   A. tried to work;not try doing

   B. tried to work;not try to do

   C. tried working;not try to do

   D. try to work;not try doing

(   ) 4. —What about        a rest?

―OK. Let's go out and have a walk.

   A. to take   B. takes

   C. taking   D. to taking

(   ) 3. ―I feel really tired.

--      

   A. Lucky you！

   B. You'd better work harder.

   C. Congratulations!

   D. Why not go and have a rest?

(   ) 2. -―I don't know how to pronounce the word "medium".

―       ask Mr Taylor for help?

   A. What about   B. Let's   C. How about   D. Why not

(   ) 1. Let's       for a walk,shall we?

   A. to go   B. going

   C. go   D. gone

4. You should (not) do sth.意为"你(不) 应该做某事"。 should为情态动词，后接动词原形。如- You should take more exercise. 你应该加强锻炼。

3.         意为"做某事是一个好主意"。 h作形式主语，句子的真正主语是动词不定式。如： It's a good idea to send a birthday card to him. 给他寄一张生日贺卡是一个好主意。

2. Why don't you do sth.？意为"为什么不做某事呢？"，相当于      。如： Why don't you write them down? =      write them down? 

为何不把它们记下来呢？

1.         意为"做某事怎么样？"。 about 为介词，后接动词时用其动名词形式。如： How about going for a picnic at the weekend? =       going for a picnic at the weekend?

这周末去野餐怎么样？