根据句意及各题括号中所给的汉语意思，从下面的方框中选择合适的单词或词组，用其适当形式填空。

1．Could you please ________(注意；照顾)my baby when I am out?

2．What do you do in your ________(休闲)time?

3．They stopped at a ________(陡峭的)rock at last．

4．The young scientists ________(遭遇)many difficulties during their exploration．

5．The man has a lot of friends because he is very ________(外向的)．

6．I’m sorry, those overcoats are not ________(可提供的)in your colour and size．

7．I am ________(感激的)to you for helping me．

8．I do not think he can help you because he has a ________(繁重的)job．

9．She was a ________(志愿者)to help the disabled at that time．

10．They signed a ________(合同)for the supply of vehicles to the company．

11．They are holding a ________(全体职工)meeting in the hall．

12．What is the ________(根本的)difference between these two economic systems?

13．There are also people who come to take such courses as Chinese ________(传统的)medicine, painting, calligraphy and photography．

14．The product was developed ________(作为……的回应)customer demand．

15．It is OK ________(在理论上), but I do not think it can be carried out in practice．