My mother’s birthday is coming, I don’t know _________for her．
| A．what to buy | B．how to wear |
| C．when to go | D．why to do |
The little boy was last seen __________ football by the river.
| A．to play | B．play | C．played | D．playing |
They found __________ impossible to finish so much work in such a short time.
| A．that | B．it | C．it is | D．this |
— I rang the bell for a long time last night, but no one opened the door.
— Oh, the family __________ a party and they didn’t hear the bell.
| A．had | B．were having | C．had had | D．have had |
Great changes __________ in my hometown in the last five years.
| A．took place | B．have been taken place |
| C．had been taken place | D．have taken place |
Mike was singing _________ his twin brother at that party.
| A．as beautiful as | B．so beautiful as | C．as beautifully as | D．so beautifully as |