Bill always seems so confident, but ________ he’s extremely shy.
| A．in vain | B．in contrast | C．in reality | D．in surprise |
Everything was placed exactly ______ he wanted it for the graduation ceremony.
| A．while | B．when | C．where | D．though |
The three of us ______ around Europe for about a month last summer.
| A．traveled | B．have traveled | C．had traveled | D．travel |
Experiments of this kind _______in both the U.S. and Europe well before the Second World War started.
| A．have conducted | B．have been conducted |
| C．had conducted | D．had been conducted |
Robert is said________ abroad, but I don’t know what country he studied in.
| A．to have studied | B．to study |
| C．to be studying | D．to be studied |
We live in an age ________ more information is available with greater ease than ever before.
| A．why | B．when | C．to whom | D．on which |