Sam finds sweeping robots useful，and he plans to buy _____for his grandma．（ ）
A．itB．oneC．thisD．that
Tom wants to study at ______university in Europe，but hasn't decided which one to go to yet．（ ）
A．anB．aC．theD．不填
Could you tell me ？
Every four years．The 24th will take place in China in 2022．（ ）
A．how long the Winter Olympic Games last
B．how long do the Winter Olympic Games last
C．how often are the Winter Olympic Games held
D．how often the Winter Olympic Games are held
Mr Ling．I have some difficulty the article．
Remember it three or four times at least．（ ）
A．to understand；reading
B．understanding；reading
C．understanding；to read
D．to understand；to read
The novel seems a little boring．
You won't enjoy it you put your heart into it．（ ）
A．whenB．ifC．afterD．unless
Wechat（微信）really influences people's life．
．It is easier for us to keep in touch with others．（ ）
A．MainlyB．ExactlyC．SimplyD．Mostly