根据句意，用括号内所给动词的适当形式填空。（必要时加助动词或情态动词）
The shop was crowded with people ________ （wait）for presents．
Alexander Graham Bell ________ （invent）the telephone in l876．
It isn’t possible for me ________ （write）so many words in five minutes．
Work hard，and you ________ （improve）your English very soon．
Could you please ________ （not speak）so loud?
By the time I got up，my mother ________ already ________ （cook）the breakfast．
The girl is often heard ________ （sing）in the next room．
I like playing computer games，but I can’t spend much time ________ （play）it．
Look! It’s raining heavily．Why not ________ （take）a raincoat with you?
We know each other well because we ________ （be）friends since ten years ago．