Although the lecture had already been on for five minutes,I was still not able to find a chair___
| A．to sit |
| B．for to sit on |
| C．to sit on |
| D．for sitting |
-- How many people are expected to come to your party tomorrow afternoon?
-- I send out thirty invitations but one third _____.
| A．didn’t show up | B．won’t show up |
| C．hadn’t showed up | D．doesn’t show up |
The living room is clean and tidy, with a dining table already ______ for a meal to be cooked.
| A．laid | B．laying | C．to lay | D．being laid |
Life is like riding a bicycle. ______your balance, you must keep moving.
| A．Keeping | B．To keep |
| C．Keep | D．Being kept |
With time going by, we have come to realize that creativity is it takes to keep a nation highly competitive.
| A．what | B．how | C．why | D．that |
A kind-hearted passenger paid for Tim’s ticket, without which he _____ the last train.
| A．couldn’t have caught | B．didn’t catch |
| C．couldn’t catch | D．hadn’t caught |