The fact has worried many scientists ________the earth is becoming warmer and warmer these years.
A．what B．which C．that D．whose
The number of foreign students attending Chinese universities ________rising steadily since 2010.
A．is B．are
C．has been D．have been
Only then ________how much damage had been caused.
A．she realized B．she had realized
C．had she realized D．did she realize
Memories ________on him as soon as he met the friend whom he had not heard from for over thirty years.
A．crowded in B．resulted in
C．joined in D．got in
The shirt is so expensive. Can you reduce the price ________a third?
A．to B．by C．of D．at
If we are not ________the progress we have made，we will have greater success.
A．interested in B．strict in
C．popular with D．content with
