—What is the price of gas these days?    —Oh, it ____________ sharply since last month.
#102165
A
is rising
B
has risen
C
is arising
D
has arisen
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It's the third time ________ late for school this week. 
#101545
A
that you are
B
you are
C
when you arrived
D
that you have been
Experiments of this kind   in both the U.S.and Europe well before the Second World War.
#102432
A
have conducted
B
have been conducted
C
had conducted
D
had been conducted
 ________ we ________ much longer, we might not even have had the spot on the rooftop.
#103275
A
Should; hesitate
B
Was; hesitating
C
Did; hesitate
D
Had; hesitated
 I first met Lisa three years ago. She _____ at a shop at the time.
#104141
A
has worked  
B
was working
C
had been worked
D
had worked