Between the two parts of the concert is an interval, ______ the audience can buy ice-cream.
| A．when | B．where | C．that | D．which |
Mr. Wang made up his mind to devote all he could ____ his oral English before going abroad.
| A．improve | B．to improving | C．improving | D．to improve |
Staying in a different country, just watch others to see _____ they act to decide what the best to say is.
| A．What | B．Why | C．how | D．when |
The cheering went on for quite some time _____ it died down and people took their seats again.
| A．Before | B．Since | C．As | D．when |
—I _________ his telephone number.
—I have his number, but I _________ to bring my phone book.”
| A．forget, forget | B．forgot, forgot | C．forgot, forget | D．forget, forgot |
He was busy preparing a speech , only _______ once in a while to rise from the table for a tea .
| A．stopping | B．to stop | C．to have stopped | D．having stopped |