1.The room was too hot. I tried________ the window, but it didn’t help.

opening

to open

having opened.

2. I don’t think that children are used to________ early.

a)getting up

b)get up

c)having got up

3. They hate_______ on long walks.

a)getting 

b)to get

c)get

4. “Can I give you a lift?” “No thanks. I’d rather______”.

a)to walk 

b)walk

c)walking

5. I am looking forward to_____ my holiday/

a)have

b)had

c)having

6. He is keen on_____ fit.

a)to keep

b)keeping

c)keep