How can you expect him to make any progress ______ you never give him a chance to have a try?
| A．when | B．unless | C．once | D．until |
Can you tell me Steve is from America or not？
| A．that | B．whether | C．what | D．where |
He was puzzled by this phenomenon. He began to try every approach _________ the best way of working it out.
| A．known to find | B．knowing to find | C．known finding | D．knowing finding |
He was puzzled by this phenomenon. He began to try every approach _________ the best way of working it out.
| A．known to find | B．knowing to find | C．known finding | D．knowing finding |
All the workers think it very necessary to safety regulations and workshop
rules.
| A．campaign | B．inspire | C．confuse | D．observe |
-----Are you ____to be out late tonight?
-----No,because it is rather cold outside.
| A．possible | B．maybe | C．probable | D．likely |