The girl in the classroom ______ be Sarah．She has gone to the library．（ ）
A．mayB．mustC．can'tD．needn't
﹣﹣﹣ ________ is it since the Communist Party of China（中国共产党）was founded？
﹣﹣﹣ Ninety﹣nine years． It's her 100th birthday next year．（ ）
A．How oftenB．How longC．How soon
The kid is doing his lessons ________ in order to pass the test．（ ）
A．wildlyB．carefullyC．lazily
The twin brothers are busy ________ artworks from ocean waste．（ ）
A．makingB．makeC．to make
Han Mei， a good friend of mine， ________ me a lot with my English in the past three years．（ ）
A．helpsB．helpedC．has helped
﹣ I hear your uncle and aunt have moved to the countryside．
﹣ Yes． They think the life in the countryside is more ________．（ ）
A．similarB．boringC．peaceful