________ the convenience of digital payment, many senior citizens started to use smart phones.
To enjoy
Enjoying
To have enjoyed
Enjoy
The disappearance of dinosaurs is not necessarily caused by astronomical incidents. But _________explanations are hard to find.
alternative
aggressive
ambiguous
apparent
--What does the stuff on your T-shirt mean ?
--It's nothing. Just something _________.
as clear as day
off the top of my head
under my nose
beyond my wildest dreams
Determining where we are _________our surroundings remains an essential skill for our survival.
in contrast to
in defense of
in face of
in relation to
He's been informed that he _________for the scholarship because of his academic background.
hasn't qualified
hadn't qualified
doesn't qualify
wasn't qualifying
A quick review of successes and failures at the end of year will help _________your year ahead.
shape
switch
stretch
sharpen