When is the time to visit Brazil？
In August and September，I think．Not too cold，not too hot．（ ）
A．hottestB．hotterC．bestD．better
A year has four seasons and it______twelve months．（ ）
A．divided intoB．is dividing into
C．was divided intoD．is divided into
I heard your father had gone to Beijing on business．
Yes，And he_____in three weeks．（ ）
A．will returnB．has returned
C．returnedD．returns
I shouted to you at the gate，but you didn't hear me．
Really？I____a telephone call to my mother．（ ）
A．makeB．was makingC．madeD．have made
We will fail the exam____we study hard．
That's why we are trying our best to prepare for the exam．（ ）
A．untilB．whenC．unlessD．how
How time flies！We should show love for our parents and make them ______how much they mean to us．（ ）
A．to knowB．knowingC．knewD．know