The old man __________ in Tibet for two years as a volunteer teacher；it is an experience he often mentions.
#101367
A
served
B
serves
C
is serving
D
has served
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The children ＿＿＿＿＿＿ very quiet； I wonder what they ＿＿＿＿up to.
#104649
A
were； are being
B
are being； are
C
are； do
D
are being； do
It’s said that the early European playing-cards ______ for education.
#99874
A
have designed
B
were designed
C
have been designed
D
were being designed
．Although it in the desert most of the year, people still live there．
#102773
A
doesn’t rain
B
didn’t rain
C
hasn’t rained
D
hadn’t rained
I found the lecture hard to follow because it _______ when I arrived.
#99091
A
started
B
was starting
C
would start
D
had started
I _______to go shopping that Saturday, but the bad weather made me change my mind.
#102363
A
plan
B
would plan
C
had planned
D
have planned