In order to keep the balance of ecosystem, every possible means _______to deal with the problems of the over-exploiting of natural resources

Mar Levine, ____ scientist at University ofPennsylvania, US, has found that competitive eaters have stomachs that canexpand like ____ balloon.

My son isn’t good at math. Could you please givehim — Sure.

__ is surprising to us is that Tom, for _______English was once boring, can speak English fluently as though he were a nativespeaker

How are you now Go to see the doctor ____ you don’t feel well.