Hearing his words，I couldn’t decide ______or remain.
| A．whether to go abroad | B．if I go abroad |
| C．if to go abroad | D．to go abroad |
The man we followed suddenly stopped and looked as if ______ whether he was going in the right direction.
| A．seeing | B．having seen | C．to see | D．to have seen |
Tom pretended______it but in fact，he knew it very well.
| A．not listen to | B．not to hear about |
| C．not to have heard about | D．not to be listening to |
Without facts，we can’t form a correct opinion，for we need to have actual knowledge______our thinking.
| A．which to be based on | B．which to base on |
| C．on which to base | D．which to base |
The new coat looks too large on Mary，so her mother had to______.
| A．cut it out | B．cut it down | C．cut it off | D．cut it up |