在参数方程（t为参数）所表示的曲线上有B、C两点，它们对应的参数值分别为t1、t2，则线段BC的中点M对应的参数值是（ ）A、 B、 C、 D、
My grandfather still plays tennis now and then, ________he's in his nineties.
as long as
as if
even though
in case
________it easier to get in touch with us, you'd better keep this card at hand.
Made
Make
Making
To make
I ________half of the English novel，and I'll try to finish it at the weekend.
read
have read
am reading
will read
Your support is important to our work. ________you can do helps.
However
Whoever
Whatever
Wherever
-Excuse me，which movie are you waiting for?
-The new Star Wars.We ________here for more than two hours.
waited
wait
would be waiting
have been waiting
（t为参数）所表示的曲线上有B、C两点，它们对应的参数值分别为t1、t2，则线段BC的中点M对应的参数值是（ ）
B、
C、
D、
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