He, a Nobelist, made great ______________ to researching in this area.
| A．encouragements | B．constitutions | C．breakthrough | D．contributions |
There as on why Igave in is____if I didn’t.
| A．because she would be disappointed | B．that she would be disappointed |
| C．because she would have a disappointment | D．for she would be disappointed |
.No matter how fast we worked,____.
| A．we couldn’t catch up with them | B．and we couldn’t catch up with them |
| C．so we couldn’t catch up with them | D．but we couldn’t catch up with them |
.The teache rfound ____ difficult to decide____ he would take with him to attend the
conference.
| A．it;whom | B．himself;who | C．this;whom | D．that;who |
Living things are dying out quickly.Let’s ask____destroying the in the pastyears.
| A．what part people have been playing | B．people have played in |
| C．what part people have played in | D．people have been playing what part |
The man who was being followed stopped from time to time____he wanted to ti ehis
shoelaces.
| A．as if | B．like | C．what | D．as |