Experiments of this kind ______in both the U. S. and Europe well before the Second World War.
| A．have conducted |
| B．have been conducted |
| C．had conducted |
| D．had been conducted |
More strict measures should be taken____more people are infected with the virus of H1N1 flu.
| A．so that | B．as if | C．in case | D．even if |
—Jim, you ______ quiet! Don’t you know it’s time for class now?
—Sorry, sir.
| A．being | B．be | C．are | D．will be |
—What happened to the old lady?
—She was observed ______ of her handbag.
| A．rob | B．to rob | C．robbing | D．robbed |
. If you can’t settle the dispute by yourselves, I’ll call the police and they’ll ______.
| A．take up | B．take in | C．take on | D．take over |
_______ to wait a long time at the dentist’s, Mike decided to take along a magazine to read.
| A．Expected | B．Not expected | C．Expecting | D．Not expecting |