I hope the technician is able *to fix / fixing* the problem.
to fix
Of all the smartphones here, I would prefer *buying this one/ to buy this one*
to buy this one
Dev, please stop *to surf / surfing* the net and do your homework.
surfing
It was late but Tessa carried on *to chat online/ chatting online*
chatting online
I don't remember *to turn off/ turning off* the TV last night.
turning off
Luke and Phill agreed *sharing / to share* the laptop.
to share
I heard Oliver *say / to say* that he lost his phone.
say
I’ve got a new MacBook and Chris offered *setting it up for me/to set it up for me*
to set it up for me
Do you fancy *to go / going* to the technology exhibition?
going
That’s a strange-looking gadget. What *do you think / are you thinking* it is?
do you think
You should be preparing for your final exams instead of *surf the internet/ surfing the internet*
surfing the internet
I prefer sending text messages to *make / making* phone calls.
making
He lost his phone yesterday, and he *goes / is going* crazy looking for it.
is going