The meeting was expected to start at 9 o'clock but the manager didn't turn up ______ twenty minutes later.
| A．before | B．until | C．after | D．since |
Yesterday I went ________ I spent the holiday last summer.
| A．where | B．when | C．what | D．which |
The classroom is big enough________，but we'll have to move if we have more students.
| A．for the moment | B．on the moment |
| C．in a moment | D．for a moment |
Through the window，we can see his large house________.
| A．in a distance | B．at a distance |
| C．in the distance | D．at the distance |
Mr.Smith as well as two of his students ________ the experiment with care at the moment.
| A．is doing | B．are doing | C．does | D．do |
A lot of banks are ________ to the new electronic system because it's more efficient.
| A．switching on | B．switching off |
| C．switching over | D．switching from |