--- Have you solved your problem?
---I've kept on thinking about that matter ______, but I have no idea yet now.
A．at times B．some time C．at a time D．all the time
I am surprised to see you not smoking. You ______.
A．are used to B．were used to C．used to D．used to be
--- The two old friends were ______ busy ______ with each other ______ the time.
--- Yes. They hadn’t met for long.
A．too; to talk; to forget B．too; talking; to forget
C．so; to talk; that they forgot D．so; talking; that they forgot
______ of the students in my class plan to go abroad for ______ study in the future.
A．Two-thirds; farther B．One-thirds; farther
C．Three-fourths; further D．Three-fifth; further
Sound travels ______ air ______ a speed of about 340 metres per second.
A．over; in B．through; at C．by; at D．through; over
We knew little about Shu-How Lin, a basketball player from New York Knicks, __________ we watched the basketball matches in NBA.
A. until B. if C. when D. because
