These boys had problems________to the top of that mountain．
A．getting
B．to getting
C．get
D．to get
Three fifths of the students in our school________boys．
A．is
B．are
C．am
D．be
Singapore is a good place________a holiday．
A．to take
B．take
C．to taking
D．taking
There are________people who want to travel to China．
A．two thousands
B．two thousand of
C．thousands of
D．thousand of
—________she________to Singapore before？
—Yes．She________there last week．
A．Did；go；went
B．Has；been；went
C．Have；been；went
D．Will；go；went
Last term he had problems________math．
A．to learn
B．learn
C．to learning
D．learning
