Bing Xin wrote her first article at the age of 19 and finished her last one at the age of 94. Through all those years, she _________.
| A．had often studied | B．was always studying |
| C．studied hard | D．had always been studying |
. -- Do you think Allan came by taxi?
-- No. If he had, I don't believe he ______ his bike here.
| A．would leave | B．left | C．would have left | D．had left |
The road becomes so crowded during rush hours, ______ it becomes a very slow route.
| A．which | B．when | C．where | D．that |
-- The classroom looks like a mess!
-- Yes, but who left the waste paper ______ around?
| A．lie | B．to lie | C．lay | D．lying |
-- I think we'll give Bob a ring.
-- We ______ . We have been out of touch with him for ages.
| A．will | B．may | C．have to | D．ought to |
Honey, stay outside and ______ a few minutes; then we'll go to church together.
| A．hang around | B．hang up | C．hang on | D．hang out |